Move RenderWidgetHostView into content namespace. Fix include paths.

chrome/browser/ui/views/tab_contents/native_tab_contents_view.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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 CHROME_BROWSER_UI_VIEWS_TAB_CONTENTS_NATIVE_TAB_CONTENTS_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_TAB_CONTENTS_NATIVE_TAB_CONTENTS_VIEW_H_
 #pragma once
 
 #include <string>
 
 #include "base/string16.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
 #include "ui/gfx/native_widget_types.h"
 
 class RenderWidgetHost;
+struct WebDropData;
+namespace content {
 class RenderWidgetHostView;
-struct WebDropData;
+}
 namespace gfx {
 class Point;
 }
 namespace internal {
 class NativeTabContentsViewDelegate;
 }
 namespace views {
 class NativeWidget;
 }
 
 class NativeTabContentsView {
  public:
   virtual ~NativeTabContentsView() {}
 
   static NativeTabContentsView* CreateNativeTabContentsView(
       internal::NativeTabContentsViewDelegate* delegate);
 
   virtual void InitNativeTabContentsView() = 0;
 
   virtual void Unparent() = 0;
 
-  virtual RenderWidgetHostView* CreateRenderWidgetHostView(
+  virtual content::RenderWidgetHostView* CreateRenderWidgetHostView(
       RenderWidgetHost* render_widget_host) = 0;
 
   virtual gfx::NativeWindow GetTopLevelNativeWindow() const = 0;
 
   virtual void SetPageTitle(const string16& title) = 0;
 
   virtual void StartDragging(const WebDropData& drop_data,
                              WebKit::WebDragOperationsMask ops,
                              const SkBitmap& image,
                              const gfx::Point& image_offset) = 0;
   virtual void CancelDrag() = 0;
   virtual bool IsDoingDrag() const = 0;
   virtual void SetDragCursor(WebKit::WebDragOperation operation) = 0;
 
   virtual views::NativeWidget* AsNativeWidget() = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TAB_CONTENTS_NATIVE_TAB_CONTENTS_VIEW_H_