diff --git a/docs/about/release-notes.md b/docs/about/release-notes.md
index e3739110..6a040e05 100644
--- a/docs/about/release-notes.md
+++ b/docs/about/release-notes.md
@@ -229,8 +229,9 @@ authors should review how [search and themes] interact.
 [search config]: ../user-guide/configuration.md#search
 [search and themes]: ../user-guide/custom-themes.md#search_and_themes
 
-### Other Changes and Additions to Development Version
+### Other Changes and Additions to Version 1.0
 
+* Empty `extra_css` and `extra_javascript` settings no longer raise a warning.
 * Add highlight.js configuration settings to built-in themes (#1284).
 * Close search modal when result is selected (#1527).
 * Add a level attribute to AnchorLinks (#1272).
@@ -404,7 +405,7 @@ and user created and third-party templates should be updated as outlined below:
 In previous versions of MkDocs, if the `extra_css` or `extra_javascript` config
 settings were empty, MkDocs would scan the `docs_dir` and auto-populate each
 setting with all of the CSS and JavaScript files found. On version 0.16 this
-behavior was deprecated and a warning was issued. In 1.0 any unlisted CSS and
+behavior was deprecated and a warning was issued. In 0.17 any unlisted CSS and
 JavaScript files will not be included in the HTML templates, however, a warning
 will be issued. In other words, they will still be copied to the `site-dir`, but
 they will not have any effect on the theme if they are not explicitly listed.
diff --git a/mkdocs/config/config_options.py b/mkdocs/config/config_options.py
index a631da7e..a4fd5c42 100644
--- a/mkdocs/config/config_options.py
+++ b/mkdocs/config/config_options.py
@@ -462,62 +462,6 @@ class Theme(BaseConfigOption):
         config[key_name] = theme.Theme(**theme_config)
 
 
-class Extras(OptionallyRequired):
-    """
-    Extras Config Option
-
-    Validate the extra configs are a list and issue a warning for any files
-    found in the docs_dir which are not listed here.
-
-    TODO: Delete this in a future release and use
-    `config_options.Type(list, default=[])` instead.
-    """
-
-    def __init__(self, file_match=None, **kwargs):
-        super(Extras, self).__init__(**kwargs)
-        self.file_match = file_match
-
-    def run_validation(self, value):
-        if isinstance(value, list):
-            return value
-        else:
-            raise ValidationError(
-                "Expected a list, got {0}".format(type(value)))
-
-    def walk_docs_dir(self, docs_dir):
-        if self.file_match is None:
-            raise StopIteration
-
-        for (dirpath, dirs, filenames) in os.walk(docs_dir, followlinks=True):
-            dirs.sort()
-            for filename in sorted(filenames):
-                fullpath = os.path.join(dirpath, filename)
-
-                # Some editors (namely Emacs) will create temporary symlinks
-                # for internal magic. We can just ignore these files.
-                if os.path.islink(fullpath):
-                    local_fullpath = os.path.join(dirpath, os.readlink(fullpath))
-                    if not os.path.exists(local_fullpath):
-                        continue
-
-                relpath = os.path.normpath(os.path.relpath(fullpath, docs_dir))
-                if self.file_match(relpath):
-                    yield relpath
-
-    def post_validation(self, config, key_name):
-        # Only issue warnings for missing files if the setting is empty
-        # as autopopulating only used to work if the setting was empty.
-        if not config[key_name]:
-            actual_files = list(self.walk_docs_dir(config['docs_dir']))
-            if actual_files:
-                self.warnings.append((
-                    "Some files in your 'docs_dir' are not listed in the '{0}' "
-                    "config setting and will be ignored by the theme. Add the "
-                    "following files to the '{0}' config setting if you want "
-                    "them to have an effect on the theme: ['{1}']"
-                ).format(key_name, "', '".join(actual_files)))
-
-
 class Nav(OptionallyRequired):
     """
     Nav Config Option
diff --git a/mkdocs/config/defaults.py b/mkdocs/config/defaults.py
index 99600b3b..0ec7391b 100644
--- a/mkdocs/config/defaults.py
+++ b/mkdocs/config/defaults.py
@@ -81,9 +81,8 @@ DEFAULT_SCHEMA = (
 
     # Specify which css or javascript files from the docs directory should be
     # additionally included in the site.
-    ('extra_css', config_options.Extras(file_match=utils.is_css_file, default=[])),
-    ('extra_javascript', config_options.Extras(
-        file_match=utils.is_javascript_file, default=[])),
+    ('extra_css', config_options.Type(list, default=[])),
+    ('extra_javascript', config_options.Type(list, default=[])),
 
     # Similar to the above, but each template (HTML or XML) will be build with
     # Jinja2 and the global context.
diff --git a/mkdocs/utils/__init__.py b/mkdocs/utils/__init__.py
index f94defe2..8ee33424 100644
--- a/mkdocs/utils/__init__.py
+++ b/mkdocs/utils/__init__.py
@@ -193,27 +193,6 @@ def is_markdown_file(path):
     return any(fnmatch.fnmatch(path.lower(), '*{0}'.format(x)) for x in markdown_extensions)
 
 
-def is_css_file(path):
-    """
-    Return True if the given file path is a CSS file.
-    """
-    ext = os.path.splitext(path)[1].lower()
-    return ext in [
-        '.css',
-    ]
-
-
-def is_javascript_file(path):
-    """
-    Return True if the given file path is a Javascript file.
-    """
-    ext = os.path.splitext(path)[1].lower()
-    return ext in [
-        '.js',
-        '.javascript'
-    ]
-
-
 def is_html_file(path):
     """
     Return True if the given file path is an HTML file.