Revert of Sets the default background color of inline signin and user manager to grey

content/browser/frame_host/render_widget_host_view_guest.h

 // Copyright 2014 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_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_GUEST_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_GUEST_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 42 matching lines @@
   virtual bool OnMessageReceived(const IPC::Message& msg) override;
   virtual void InitAsChild(gfx::NativeView parent_view) override;
   virtual void SetSize(const gfx::Size& size) override;
   virtual void SetBounds(const gfx::Rect& rect) override;
   virtual void Focus() override;
   virtual bool HasFocus() const override;
   virtual gfx::NativeView GetNativeView() const override;
   virtual gfx::NativeViewId GetNativeViewId() const override;
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() override;
   virtual gfx::Rect GetViewBounds() const override;
-  virtual void SetBackgroundColor(SkColor color) override;
+  virtual void SetBackgroundOpaque(bool opaque) override;
   virtual gfx::Size GetPhysicalBackingSize() const override;
   virtual base::string16 GetSelectedText() const override;
 
   // RenderWidgetHostViewBase implementation.
   virtual void InitAsPopup(RenderWidgetHostView* parent_host_view,
                            const gfx::Rect& pos) override;
   virtual void InitAsFullscreen(
       RenderWidgetHostView* reference_host_view) override;
   virtual void WasShown() override;
   virtual void WasHidden() override;
@@ skipping 106 matching lines @@
   RenderWidgetHostViewBase* platform_view_;
 #if defined(USE_AURA)
   scoped_ptr<ui::GestureRecognizer> gesture_recognizer_;
 #endif
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewGuest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_WIDGET_HOST_VIEW_GUEST_H_