Remove setErrorMessageCallback from WebGraphicsContext3D.

gpu/command_buffer/client/context_support.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 GPU_COMMAND_BUFFER_CLIENT_CONTEXT_SUPPORT_H_
 #define GPU_COMMAND_BUFFER_CLIENT_CONTEXT_SUPPORT_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
@@ skipping 34 matching lines @@
   virtual void ScheduleOverlayPlane(int plane_z_order,
                                     gfx::OverlayTransform plane_transform,
                                     unsigned overlay_texture_id,
                                     const gfx::Rect& display_bounds,
                                     const gfx::RectF& uv_rect) = 0;
 
   // Returns an ID that can be used to globally identify the share group that
   // this context's resources belong to.
   virtual uint64_t ShareGroupTracingGUID() const = 0;
 
+  // Sets a callback to be run when an error occurs.
+  virtual void SetErrorMessageCallback(
+      const base::Callback<void(const char*, int32_t)>& callback) = 0;
+
  protected:
   ContextSupport() {}
   virtual ~ContextSupport() {}
 };
 
 }
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_CONTEXT_SUPPORT_H_