Extract content dependency from keyboard code

ash/test/content/keyboard_controller_proxy_stub.cc

-// Copyright 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 "ash/test/content/keyboard_controller_proxy_stub.h"
-
-#include "ash/content/shell_content_state.h"
-#include "ash/shell.h"
-#include "ash/shell_delegate.h"
-#include "ash/wm/window_util.h"
-#include "ui/aura/window.h"
-#include "ui/aura/window_tree_host.h"
-#include "ui/base/ime/mock_input_method.h"
-
-namespace ash {
-
-KeyboardControllerProxyStub::KeyboardControllerProxyStub()
-    : keyboard::KeyboardControllerProxy(ShellContentState::GetInstance()
-                                            ->GetActiveBrowserContext()) {}
-
-KeyboardControllerProxyStub::~KeyboardControllerProxyStub() {}
-
-bool KeyboardControllerProxyStub::HasKeyboardWindow() const {
-  return keyboard_;
-}
-
-aura::Window* KeyboardControllerProxyStub::GetKeyboardWindow() {
-  if (!keyboard_) {
-    keyboard_.reset(new aura::Window(&delegate_));
-    keyboard_->Init(ui::LAYER_NOT_DRAWN);
-  }
-  return keyboard_.get();
-}
-
-ui::InputMethod* KeyboardControllerProxyStub::GetInputMethod() {
-  aura::Window* active_window = wm::GetActiveWindow();
-  aura::Window* root_window = active_window ? active_window->GetRootWindow()
-                                            : Shell::GetPrimaryRootWindow();
-  return root_window->GetHost()->GetInputMethod();
-}
-
-void KeyboardControllerProxyStub::RequestAudioInput(
-    content::WebContents* web_contents,
-    const content::MediaStreamRequest& request,
-    const content::MediaResponseCallback& callback) {}
-
-void KeyboardControllerProxyStub::LoadSystemKeyboard() {}
-
-void KeyboardControllerProxyStub::ReloadKeyboardIfNeeded() {}
-
-}  // namespace ash