views: Extract Widget observer into its own header file.

chrome/browser/ui/views/omnibox/omnibox_view_views.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 "chrome/browser/ui/views/omnibox/omnibox_view_views.h"
 
 #include "base/logging.h"
 #include "base/property_bag.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 31 matching lines @@
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/render_text.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/textfield/textfield.h"
 #include "ui/views/events/event.h"
 #include "ui/views/ime/input_method.h"
 #include "ui/views/layout/fill_layout.h"
 #include "ui/views/views_delegate.h"
+#include "ui/views/widget/widget.h"
 
 #if defined(USE_AURA)
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/compositor/layer.h"
 #endif
 
 using content::WebContents;
 
 namespace {
@@ skipping 894 matching lines @@
                                                const ui::Range& range) {
   if (text != GetText())
     textfield_->SetText(text);
   textfield_->SelectRange(range);
 }
 
 string16 OmniboxViewViews::GetSelectedText() const {
   // TODO(oshima): Support instant, IME.
   return textfield_->GetSelectedText();
 }