Move creation of content TabContentsViews to content so that we can hide these headers through DEPS…

content/public/browser/web_contents_view_mac_delegate.h

-// 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.
-
-#ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_VIEW_MAC_DELEGATE_H_
-#define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_VIEW_MAC_DELEGATE_H_
-#pragma once
-
-#import <Cocoa/Cocoa.h>
-
-@protocol RenderWidgetHostViewMacDelegate;
-
-namespace content {
-
-class RenderWidgetHost;
-class WebDragDestDelegate;
-struct ContextMenuParams;
-
-// This interface allows a client to extend the functionality of
-// WebContentsViewMac.
-class WebContentsViewMacDelegate {
- public:
-  virtual ~WebContentsViewMacDelegate() {}
-
-  // Returns a newly-created delegate for the RenderWidgetHostViewMac, to handle
-  // events on the responder chain.
-  virtual NSObject<RenderWidgetHostViewMacDelegate>*
-      CreateRenderWidgetHostViewDelegate(
-          RenderWidgetHost* render_widget_host) = 0;
-
-  // Returns a delegate to process drags not handled by content.
-  virtual WebDragDestDelegate* DragDelegate() = 0;
-
-  // Shows a context menu.
-  virtual void ShowContextMenu(const content::ContextMenuParams& params) = 0;
-
-  // Notifications that the native view was created/destroyed.
-  virtual void NativeViewCreated(NSView* view) = 0;
-  virtual void NativeViewDestroyed(NSView* view) = 0;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_VIEW_MAC_DELEGATE_H_