Extract content dependency from keyboard code

chrome/browser/ui/ash/ash_keyboard_controller_proxy.h

-// 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.
-
-#ifndef CHROME_BROWSER_UI_ASH_ASH_KEYBOARD_CONTROLLER_PROXY_H_
-#define CHROME_BROWSER_UI_ASH_ASH_KEYBOARD_CONTROLLER_PROXY_H_
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "content/public/browser/web_contents_observer.h"
-#include "ui/keyboard/keyboard_controller_proxy.h"
-
-namespace content {
-class BrowserContext;
-class WebContents;
-}
-namespace extensions {
-class ExtensionFunctionDispatcher;
-class WindowController;
-}
-namespace gfx {
-class Rect;
-}
-namespace keyboard {
-class KeyboardController;
-class KeyboardControllerObserver;
-}
-namespace ui {
-class InputMethod;
-}
-
-// Subclass of KeyboardControllerProxy. It is used by KeyboardController to get
-// access to the virtual keyboard window and setup Chrome extension functions.
-class AshKeyboardControllerProxy
-    : public keyboard::KeyboardControllerProxy,
-      public content::WebContentsObserver {
- public:
-  explicit AshKeyboardControllerProxy(content::BrowserContext* context);
-  ~AshKeyboardControllerProxy() override;
-
- private:
-  // keyboard::KeyboardControllerProxy overrides
-  ui::InputMethod* GetInputMethod() override;
-  void RequestAudioInput(
-      content::WebContents* web_contents,
-      const content::MediaStreamRequest& request,
-      const content::MediaResponseCallback& callback) override;
-  void SetupWebContents(content::WebContents* contents) override;
-  void SetController(keyboard::KeyboardController* controller) override;
-  void ShowKeyboardContainer(aura::Window* container) override;
-
-  // The overridden implementation dispatches
-  // chrome.virtualKeyboardPrivate.onTextInputBoxFocused event to extension to
-  // provide the input type information. Naturally, when the virtual keyboard
-  // extension is used as an IME then chrome.input.ime.onFocus provides the
-  // information, but not when the virtual keyboard is used in conjunction with
-  // another IME. virtualKeyboardPrivate.onTextInputBoxFocused is the remedy in
-  // that case.
-  void SetUpdateInputType(ui::TextInputType type) override;
-
-  // content::WebContentsObserver overrides
-  void RenderViewCreated(content::RenderViewHost* render_view_host) override;
-
-  scoped_ptr<keyboard::KeyboardControllerObserver> observer_;
-
-  DISALLOW_COPY_AND_ASSIGN(AshKeyboardControllerProxy);
-};
-
-#endif  // CHROME_BROWSER_UI_ASH_ASH_KEYBOARD_CONTROLLER_PROXY_H_