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

chrome/browser/extensions/extensions_service.cc

 // 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.
 
 #include "chrome/browser/extensions/extensions_service.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
@@ skipping 611 matching lines @@
   ExtensionBrowserEventRouter::GetInstance()->Init(profile_);
   ExtensionBookmarkEventRouter::GetSingleton()->Observe(
       profile_->GetBookmarkModel());
   ExtensionCookiesEventRouter::GetInstance()->Init();
   ExtensionManagementEventRouter::GetInstance()->Init();
   ExtensionProcessesEventRouter::GetInstance()->ObserveProfile(profile_);
   ExtensionWebNavigationEventRouter::GetInstance()->Init();
   event_routers_initialized_ = true;
 }
 
+const Extension* ExtensionsService::GetExtensionById(const std::string& id,
+                                                     bool include_disabled) {
+  return GetExtensionByIdInternal(id, true, include_disabled);
+}
+
 void ExtensionsService::Init() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   DCHECK(!ready_);  // Can't redo init.
   DCHECK_EQ(extensions_.size(), 0u);
 
   // Hack: we need to ensure the ResourceDispatcherHost is ready before we load
   // the first extension, because its members listen for loaded notifications.
   g_browser_process->resource_dispatcher_host();
 
@@ skipping 1438 matching lines @@
 }
 
 void ExtensionsService::SetBeingUpgraded(const Extension* extension,
                                          bool value) {
   extension_runtime_data_[extension->id()].being_upgraded = value;
 }
 
 PropertyBag* ExtensionsService::GetPropertyBag(const Extension* extension) {
   return &extension_runtime_data_[extension->id()].property_bag;
 }