Don't allow content scripts to execute on file:// urls....

chrome/common/extensions/extension_constants.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/extensions/extension_constants.h"
 
 namespace extension_manifest_keys {
 
 const wchar_t* kBackground = L"background_page";
 const wchar_t* kBrowserAction = L"browser_action";
@@ skipping 73 matching lines @@
 const char* kInvalidGlob =
     "Invalid value for 'content_scripts[*].*[*]'.";
 const char* kInvalidIcons =
     "Invalid value for 'icons'.";
 const char* kInvalidIconPath =
     "Invalid value for 'icons[\"*\"]'.";
 const char* kInvalidJs =
     "Invalid value for 'content_scripts[*].js[*]'.";
 const char* kInvalidJsList =
     "Required value 'content_scripts[*].js is invalid.";
+const char* kInvalidJsMatches =
+    "Content scripts can not be executed on file:// urls.";
 const char* kInvalidKey =
     "Value 'key' is missing or invalid.";
 const char* kInvalidManifest =
     "Manifest file is invalid.";
 const char* kInvalidMatchCount =
     "Invalid value for 'content_scripts[*].matches. There must be at least one "
     "match specified.";
 const char* kInvalidMatch =
     "Invalid value for 'content_scripts[*].matches[*]'.";
 const char* kInvalidMatches =
@@ skipping 78 matching lines @@
     "An extension cannot have both a page action and a browser action.";
 const char* kThemesCannotContainExtensions =
     "A theme cannot contain extensions code.";
 const char* kLocalesNoDefaultLocaleSpecified =
     "Localization used, but default_locale wasn't specified in the manifest.";
 const char* kLocalesNoValidLocaleNamesListed =
     "No valid locale name could be found in _locales directory.";
 const char* kInvalidOptionsPage =
     "Invalid value for 'options_page'.";
 }  // namespace extension_manifest_errors