[Merge M54] aw: Fix FBO restore in webview functor

android_webview/browser/aw_gl_surface.h

 // Copyright 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 ANDROID_WEBVIEW_BROWSER_AW_GL_SURFACE_H_
 #define ANDROID_WEBVIEW_BROWSER_AW_GL_SURFACE_H_
 
 #include "base/macros.h"
 #include "ui/gl/gl_surface.h"
 
 namespace android_webview {
 
 // This surface is used to represent the underlying surface provided by the App
 // inside a hardware draw. Note that offscreen contexts will not be using this
 // GLSurface.
 class AwGLSurface : public gl::GLSurface {
  public:
   AwGLSurface();
 
   // Implement GLSurface.
   void Destroy() override;
   bool IsOffscreen() override;
   unsigned int GetBackingFramebufferObject() override;
   gfx::SwapResult SwapBuffers() override;
   gfx::Size GetSize() override;
   void* GetHandle() override;
   void* GetDisplay() override;
 
-  void SetBackingFrameBufferObject(unsigned int fbo);
-
  protected:
   ~AwGLSurface() override;
 
  private:
-  unsigned int fbo_;
-
   DISALLOW_COPY_AND_ASSIGN(AwGLSurface);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_AW_GL_SURFACE_H_