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

chrome/browser/errorpage_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 "base/bind.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/net/url_request_mock_util.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
@@ skipping 237 matching lines @@
           base::FilePath(FILE_PATH_LITERAL("page404.html"))),
       "SUCCESS",
       1);
 }
 
 // Protocol handler that fails all requests with net::ERR_ADDRESS_UNREACHABLE.
 class AddressUnreachableProtocolHandler
     : public net::URLRequestJobFactory::ProtocolHandler {
  public:
   AddressUnreachableProtocolHandler() {}
-  ~AddressUnreachableProtocolHandler() {}
+  virtual ~AddressUnreachableProtocolHandler() {}
 
   // net::URLRequestJobFactory::ProtocolHandler:
   virtual net::URLRequestJob* MaybeCreateJob(
       net::URLRequest* request,
       net::NetworkDelegate* network_delegate) const OVERRIDE {
     return new URLRequestFailedJob(request,
                                    network_delegate,
                                    net::ERR_ADDRESS_UNREACHABLE);
   }
 
@@ skipping 57 matching lines @@
   EXPECT_TRUE(content::ExecuteScriptAndExtractBool(
       browser()->tab_strip_model()->GetActiveWebContents(),
       "var textContent = document.body.textContent;"
       "var hasError = textContent.indexOf('ERR_NAME_NOT_RESOLVED') >= 0;"
       "domAutomationController.send(hasError);",
       &result));
   EXPECT_TRUE(result);
 }
 
 }  // namespace