cc: Make OutputSurface::BindToClient pure virtual and not return bool

cc/output/output_surface_client.h

 // Copyright 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 CC_OUTPUT_OUTPUT_SURFACE_CLIENT_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_CLIENT_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
@@ skipping 11 matching lines @@
 
 class BeginFrameSource;
 struct ManagedMemoryPolicy;
 
 class CC_EXPORT OutputSurfaceClient {
  public:
   // A notification that the swap of the backbuffer to the hardware is complete
   // and is now visible to the user.
   virtual void DidReceiveSwapBuffersAck() = 0;
 
-  // The OutputSurface is lost when the ContextProviders held by it
-  // encounter an error. In this case the OutputSurface (and the
-  // ContextProviders) must be recreated.
-  virtual void DidLoseOutputSurface() = 0;
-
   // For surfaceless/ozone implementations to create damage for the next frame.
   virtual void SetNeedsRedrawRect(const gfx::Rect& damage_rect) = 0;
 
   // For overlays.
   virtual void DidReceiveTextureInUseResponses(
       const gpu::TextureInUseResponses& responses) = 0;
 
  protected:
   virtual ~OutputSurfaceClient() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_CLIENT_H_