Revert of Implement NativeViewHostAura::InstallClip.

ui/views/widget/native_widget_aura.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 "ui/views/widget/native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/strings/string_util.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 903 matching lines @@
     // destruction unless WIDGET_OWNS_NATIVE_WIDGET is set (which is just the
     // case in tests).
     if (!destroying_) {
       if (GetWidget()->GetInputMethod())
         GetWidget()->GetInputMethod()->OnBlur();
     } else {
       DCHECK_EQ(ownership_, Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET);
     }
 
     delegate_->OnNativeBlur(gained_focus);
-    if (GetWidget()->GetFocusManager())
-      GetWidget()->GetFocusManager()->StoreFocusedView(true);
+    GetWidget()->GetFocusManager()->StoreFocusedView(true);
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeWidgetAura, aura::WindowDragDropDelegate implementation:
 
 void NativeWidgetAura::OnDragEntered(const ui::DropTargetEvent& event) {
   DCHECK(drop_helper_.get() != NULL);
   last_drop_operation_ = drop_helper_->OnDragOver(event.data(),
       event.location(), event.source_operations());
@@ skipping 220 matching lines @@
   l10n_util::AdjustUIFont(&(ncm.lfCaptionFont));
   base::win::ScopedHFONT caption_font(CreateFontIndirect(&(ncm.lfCaptionFont)));
   return gfx::FontList(gfx::Font(caption_font));
 #else
   return gfx::FontList();
 #endif
 }
 
 }  // namespace internal
 }  // namespace views