Add the "virtual" keyword on method overrides that are missing it.

chrome/browser/extensions/extensions_service.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 201 matching lines @@
   // Getter for the extension's runtime data PropertyBag.
   PropertyBag* GetPropertyBag(const Extension* extension);
 
   // Initialize and start all installed extensions.
   void Init();
 
   // Start up the extension event routers.
   void InitEventRouters();
 
   // Look up an extension by ID.
-  const Extension* GetExtensionById(const std::string& id,
-                                    bool include_disabled) {
-    return GetExtensionByIdInternal(id, true, include_disabled);
-  }
+  virtual const Extension* GetExtensionById(const std::string& id,
+                                            bool include_disabled);
 
   // Install the extension file at |extension_path|.  Will install as an
   // update if an older version is already installed.
   // For fresh installs, this method also causes the extension to be
   // immediately loaded.
   // TODO(aa): This method can be removed. It is only used by the unit tests,
   // and they could use CrxInstaller directly instead.
   void InstallExtension(const FilePath& extension_path);
 
   // Updates a currently-installed extension with the contents from
@@ skipping 163 matching lines @@
   bool show_extensions_prompts() {
     return show_extensions_prompts_;
   }
 
   Profile* profile() { return profile_; }
 
   // Profile calls this when it is being destroyed so that we know not to call
   // it.
   void DestroyingProfile();
 
-  ExtensionPrefs* extension_prefs() { return extension_prefs_; }
+  virtual ExtensionPrefs* extension_prefs() { return extension_prefs_; }
 
   // Whether the extension service is ready.
   // TODO(skerner): Get rid of this method.  crbug.com/63756
   bool is_ready() { return ready_; }
 
   // Note that this may return NULL if autoupdate is not turned on.
   ExtensionUpdater* updater() { return updater_.get(); }
 
   ExtensionToolbarModel* toolbar_model() { return &toolbar_model_; }
 
@@ skipping 182 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ExtensionsServiceTest,
                            UpdatePendingExtensionAlreadyInstalled);
   FRIEND_TEST_ALL_PREFIXES(ExtensionsServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionsServiceTest,
                            InstallAppsAndCheckStorageProtection);
   DISALLOW_COPY_AND_ASSIGN(ExtensionsService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSIONS_SERVICE_H_