Update {virtual,override} to follow C++11 style in content.

content/browser/renderer_host/render_widget_host_view_aura.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 208 matching lines @@
   void ShowDisambiguationPopup(const gfx::Rect& rect_pixels,
                                const SkBitmap& zoomed_bitmap) override;
   bool LockMouse() override;
   void UnlockMouse() override;
   void OnSwapCompositorFrame(uint32 output_surface_id,
                              scoped_ptr<cc::CompositorFrame> frame) override;
   void DidStopFlinging() override;
   void OnDidNavigateMainFrameToNewPage() override;
 
 #if defined(OS_WIN)
-  virtual void SetParentNativeViewAccessible(
+  void SetParentNativeViewAccessible(
       gfx::NativeViewAccessible accessible_parent) override;
-  virtual gfx::NativeViewId GetParentForWindowlessPlugin() const override;
+  gfx::NativeViewId GetParentForWindowlessPlugin() const override;
 #endif
 
   // Overridden from ui::TextInputClient:
   void SetCompositionText(const ui::CompositionText& composition) override;
   void ConfirmCompositionText() override;
   void ClearCompositionText() override;
   void InsertText(const base::string16& text) override;
   void InsertChar(base::char16 ch, int flags) override;
   gfx::NativeWindow GetAttachedWindow() const override;
   ui::TextInputType GetTextInputType() const override;
@@ skipping 428 matching lines @@
   // compositing surface and showing the disambiguation popup.
   gfx::Vector2dF disambiguation_scroll_offset_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAura> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_