Fix white strip issue after moving browser window with VK showing

ui/keyboard/content/keyboard_ui_content.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 "ui/keyboard/content/keyboard_ui_content.h"
 
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/values.h"
 #include "content/public/browser/render_widget_host.h"
@@ skipping 143 matching lines @@
 void KeyboardUIContent::LoadSystemKeyboard() {
   DCHECK(keyboard_contents_);
   if (keyboard_contents_->GetURL() != default_url_) {
     // TODO(bshe): The height of system virtual keyboard and IME virtual
     // keyboard may different. The height needs to be restored too.
     LoadContents(default_url_);
   }
 }
 
 void KeyboardUIContent::UpdateInsetsForWindow(aura::Window* window) {
-  aura::Window* keyboard_window = GetKeyboardWindow();
+  aura::Window* keyboard_container =
+      keyboard_controller()->GetContainerWindow();
   if (!ShouldWindowOverscroll(window))
     return;
 
   scoped_ptr<content::RenderWidgetHostIterator> widgets(
       content::RenderWidgetHost::GetRenderWidgetHosts());
   while (content::RenderWidgetHost* widget = widgets->GetNextHost()) {
     content::RenderWidgetHostView* view = widget->GetView();
     if (view && window->Contains(view->GetNativeView())) {
       gfx::Rect window_bounds = view->GetNativeView()->GetBoundsInScreen();
       gfx::Rect intersect =
-          gfx::IntersectRects(window_bounds, keyboard_window->bounds());
+          gfx::IntersectRects(window_bounds, keyboard_container->bounds());
       int overlap = ShouldEnableInsets(window) ? intersect.height() : 0;
       if (overlap > 0 && overlap < window_bounds.height())
         view->SetInsets(gfx::Insets(0, 0, overlap, 0));
       else
         view->SetInsets(gfx::Insets());
       return;
     }
   }
 }
 
@@ skipping 136 matching lines @@
           keyboard_controller()->keyboard_visible());
 }
 
 void KeyboardUIContent::AddBoundsChangedObserver(aura::Window* window) {
   aura::Window* target_window = window ? window->GetToplevelWindow() : nullptr;
   if (target_window)
     window_bounds_observer_->AddObservedWindow(target_window);
 }
 
 }  // namespace keyboard