Enable Clang warnings in .cc files for Linux+[Aura/ChromeOS]

ui/views/widget/widget_unittest.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/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/events/event_utils.h"
@@ skipping 1330 matching lines @@
 class DesktopAuraFullscreenChildWindowDestructionTest
     : public views::TestViewsDelegate,
       public aura::WindowObserver {
  public:
   DesktopAuraFullscreenChildWindowDestructionTest()
       : full_screen_widget_(NULL),
         child_window_(NULL),
         parent_destroyed_(false),
         child_destroyed_(false) {}
 
-  ~DesktopAuraFullscreenChildWindowDestructionTest() {
+  virtual ~DesktopAuraFullscreenChildWindowDestructionTest() {
     EXPECT_TRUE(parent_destroyed_);
     EXPECT_TRUE(child_destroyed_);
     full_screen_widget_ = NULL;
     child_window_ = NULL;
   }
 
   // views::TestViewsDelegate overrides.
   virtual void OnBeforeWidgetInit(
       Widget::InitParams* params,
       internal::NativeWidgetDelegate* delegate) OVERRIDE {
@@ skipping 418 matching lines @@
   gfx::Point click_location(45, 15);
   ui::MouseEvent press(ui::ET_MOUSE_PRESSED, click_location, click_location,
       ui::EF_LEFT_MOUSE_BUTTON);
   widget->OnMouseEvent(&press);
 
   // Yay we did not crash!
 }
 
 }  // namespace
 }  // namespace views