Enable Clang warnings in .cc files for Linux+[Aura/ChromeOS]

chrome/browser/extensions/notifications_apitest.cc

 // Copyright (c) 2012 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/extension_apitest.h"
 
 #include "chrome/browser/notifications/desktop_notification_service.h"
 #include "chrome/browser/notifications/desktop_notification_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 20 matching lines @@
  protected:
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(
         message_center::switches::kDisableRichNotifications);
   }
 };
 
 class NotificationIdleTest : public RichWebkitNotificationTest {
  protected:
-  virtual void SetUpCommandLine(CommandLine* command_line) {
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     RichWebkitNotificationTest::SetUpCommandLine(command_line);
 
     command_line->AppendSwitchASCII(switches::kEventPageIdleTime, "1");
     command_line->AppendSwitchASCII(switches::kEventPageSuspendingTime, "1");
   }
 
   const extensions::Extension* LoadExtensionAndWait(
       const std::string& test_name) {
     LazyBackgroundObserver page_complete;
     base::FilePath extdir = test_data_dir_.AppendASCII(test_name);
@@ skipping 68 matching lines @@
   const extensions::Extension* extension =
       LoadExtensionAndWait("notifications/api/unload");
   ASSERT_TRUE(extension) << message_;
 
   // Lazy Background Page has been shut down.
   ExtensionProcessManager* pm =
       extensions::ExtensionSystem::Get(profile())->process_manager();
   EXPECT_FALSE(pm->GetBackgroundHostForExtension(last_loaded_extension_id_));
 }
 #endif