Use a mocked compositor for unit tests

views/widget/widget.cc

 // Copyright (c) 2011 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 "views/widget/widget.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
 #include "ui/base/l10n/l10n_font_util.h"
@@ skipping 1082 matching lines @@
   // hierarchy references this focus manager, it crashes. This will defer focus
   // manager's destruction after child NativeWidgetGtk's dtor.
   FocusManager* focus_manager = focus_manager_.release();
   if (focus_manager)
     MessageLoop::current()->DeleteSoon(FROM_HERE, focus_manager);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Widget, private:
 
-// static
-ui::Compositor*(*Widget::compositor_factory_)() = NULL;
-
 bool Widget::ShouldReleaseCaptureOnMouseReleased() const {
   return true;
 }
 
 void Widget::SaveWindowPlacement() {
   // The window delegate does the actual saving for us. It seems like (judging
   // by go/crash) that in some circumstances we can end up here after
   // WM_DESTROY, at which point the window delegate is likely gone. So just
   // bail.
   if (!widget_delegate_)
@@ skipping 70 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views