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

chrome/browser/devtools/devtools_window.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 <algorithm>
 
 #include "base/command_line.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
 #include "base/stringprintf.h"
@@ skipping 120 matching lines @@
  public:
   DevToolsConfirmInfoBarDelegate(
       InfoBarService* infobar_service,
       const ConfirmInfoBarCallback& callback,
       string16 message)
       : ConfirmInfoBarDelegate(infobar_service),
         callback_(callback),
         message_(message) {
   }
 
-  virtual string16 GetMessageText() const {
-    return message_;
-  }
+  virtual string16 GetMessageText() const OVERRIDE { return message_; }
 
-  virtual bool Accept() {
+  virtual bool Accept() OVERRIDE {
     callback_.Run(true);
     callback_.Reset();
     return true;
   }
 
-  virtual bool Cancel() {
+  virtual bool Cancel() OVERRIDE {
     callback_.Run(false);
     callback_.Reset();
     return true;
   }
 
-  string16 GetButtonLabel(InfoBarButton button) const {
-    return l10n_util::GetStringUTF16((button == BUTTON_OK) ?
-        IDS_DEV_TOOLS_CONFIRM_ALLOW_BUTTON :
-        IDS_DEV_TOOLS_CONFIRM_DENY_BUTTON);
+  virtual string16 GetButtonLabel(InfoBarButton button) const OVERRIDE {
+    return l10n_util::GetStringUTF16((button == BUTTON_OK)
+                                         ? IDS_DEV_TOOLS_CONFIRM_ALLOW_BUTTON
+                                         : IDS_DEV_TOOLS_CONFIRM_DENY_BUTTON);
   }
 
  private:
   virtual ~DevToolsConfirmInfoBarDelegate() {
     if (!callback_.is_null()) {
       callback_.Run(false);
     }
   }
 
   ConfirmInfoBarCallback callback_;
@@ skipping 997 matching lines @@
 DevToolsDockSide DevToolsWindow::SideFromString(
     const std::string& dock_side) {
   if (dock_side == kDockSideRight)
     return DEVTOOLS_DOCK_SIDE_RIGHT;
   if (dock_side == kDockSideBottom)
     return DEVTOOLS_DOCK_SIDE_BOTTOM;
   if (dock_side == kDockSideMinimized)
     return DEVTOOLS_DOCK_SIDE_MINIMIZED;
   return DEVTOOLS_DOCK_SIDE_UNDOCKED;
 }