Extract content dependency from keyboard code

ui/keyboard/keyboard_layout_manager.cc

 // Copyright 2014 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/keyboard_layout_manager.h"
 
 #include "ui/compositor/layer_animator.h"
 #include "ui/keyboard/keyboard_controller.h"
-#include "ui/keyboard/keyboard_controller_proxy.h"
 #include "ui/keyboard/keyboard_util.h"
 
 namespace keyboard {
 
 // Overridden from aura::LayoutManager
 void KeyboardLayoutManager::OnWindowResized() {
   if (keyboard_) {
     // Container window is the top level window of the virtual keyboard window.
     // To support window.moveTo for the virtual keyboard window, as it actually
     // moves the top level window, the container window should be set to the
@@ skipping 63 matching lines @@
       // keyboard window is resized even if keyboard is hidden.
       if (controller_->keyboard_visible())
         controller_->NotifyKeyboardBoundsChanging(requested_bounds);
     }
   } else if (controller_->keyboard_mode() == FLOATING) {
     controller_->NotifyKeyboardBoundsChanging(gfx::Rect());
   }
 }
 
 }  // namespace keyboard