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

content/renderer/dom_serializer_browsertest.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 "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/hash_tables.h"
@@ skipping 133 matching lines @@
   }
   return true;
 }
 
 class LoadObserver : public RenderViewObserver {
  public:
   LoadObserver(RenderView* render_view, const base::Closure& quit_closure)
       : RenderViewObserver(render_view),
         quit_closure_(quit_closure) {}
 
-  virtual void DidFinishLoad(WebKit::WebFrame* frame) {
+  virtual void DidFinishLoad(WebKit::WebFrame* frame) OVERRIDE {
     if (frame == render_view()->GetWebView()->mainFrame())
       quit_closure_.Run();
   }
 
  private:
   base::Closure quit_closure_;
 };
 
 class DomSerializerTests : public ContentBrowserTest,
                            public WebPageSerializerClient {
  public:
   DomSerializerTests()
     : serialized_(false),
       local_directory_name_(FILE_PATH_LITERAL("./dummy_files/")) {}
 
-  virtual void SetUpCommandLine(CommandLine* command_line) {
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     command_line->AppendSwitch(switches::kSingleProcess);
 #if defined(OS_WIN) && defined(USE_AURA)
     // Don't want to try to create a GPU process.
     command_line->AppendSwitch(switches::kDisableAcceleratedCompositing);
 #endif
   }
 
   // DomSerializerDelegate.
   virtual void didSerializeDataForFrame(const WebURL& frame_web_url,
                                         const WebCString& data,
@@ skipping 829 matching lines @@
   NavigateToURL(shell(), file_url);
 
   PostTaskToInProcessRendererAndWait(
         base::Bind(
             &DomSerializerTests::
                 SubResourceForElementsInNonHTMLNamespaceOnRenderer,
             base::Unretained(this), file_url));
 }
 
 }  // namespace content