Warn on missing OVERRIDE/virtual everywhere, not just in header files.

chrome/browser/ui/ash/launcher/launcher_favicon_loader_browsertest.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/ui/ash/launcher/launcher_favicon_loader.h"
 
 #include "ash/launcher/launcher_types.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stringprintf.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 51 matching lines @@
 class LauncherFaviconLoaderBrowsertest
     : public InProcessBrowserTest,
       public LauncherFaviconLoader::Delegate {
  public:
   LauncherFaviconLoaderBrowsertest() : favicon_updated_(false) {
   }
 
   virtual ~LauncherFaviconLoaderBrowsertest() {
   }
 
-  virtual void SetUpOnMainThread() {
+  virtual void SetUpOnMainThread() OVERRIDE {
     WebContents* web_contents =
         browser()->tab_strip_model()->GetActiveWebContents();
     contents_observer_.reset(new ContentsObserver(web_contents));
     favicon_loader_.reset(new LauncherFaviconLoader(this, web_contents));
   }
 
   // LauncherFaviconLoader::Delegate overrides:
   virtual void FaviconUpdated() OVERRIDE {
     favicon_updated_ = true;
   }
@@ skipping 96 matching lines @@
   EXPECT_TRUE(favicon_loader_->GetFavicon().empty());
   ASSERT_NO_FATAL_FAILURE(ResetDownloads());
 
   ASSERT_TRUE(NavigateTo("launcher-largefavicon.html"));
   ASSERT_TRUE(WaitForContentsLoaded());
   EXPECT_TRUE(WaitForFaviconUpdated());
 
   EXPECT_FALSE(favicon_loader_->GetFavicon().empty());
   EXPECT_EQ(128, favicon_loader_->GetFavicon().height());
 }