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

content/browser/renderer_host/smooth_scroll_gesture_controller_unittest.cc

 // Copyright (c) 2013 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/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "content/browser/renderer_host/render_widget_host_delegate.h"
 #include "content/browser/renderer_host/smooth_scroll_gesture_controller.h"
 #include "content/browser/renderer_host/test_render_view_host.h"
@@ skipping 73 matching lines @@
     return rwh_;
   }
 
   MockSmoothScrollGesture* mock_gesture_;
 };
 
 class SmoothScrollGestureControllerTest : public testing::Test {
  public:
   SmoothScrollGestureControllerTest() : process_(NULL) {
   }
-  ~SmoothScrollGestureControllerTest() {
-  }
+  virtual ~SmoothScrollGestureControllerTest() {}
 
  protected:
   // testing::Test implementation:
   virtual void SetUp() OVERRIDE {
     browser_context_.reset(new TestBrowserContext());
     delegate_.reset(new MockRenderWidgetHostDelegate());
     process_ = new MockRenderProcessHost(browser_context_.get());
 #if defined(USE_AURA)
     screen_.reset(aura::TestScreen::Create());
     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, screen_.get());
@@ skipping 69 matching lines @@
   EXPECT_EQ(original_gesture, view_->mock_gesture_);
 
   // Ensure the smooth scroll is ticked.
   PostQuitMessageAndRun();
   EXPECT_LT(current_ticks, view_->mock_gesture_->called_);
 }
 
 }  // namespace
 
 }  // namespace content