Remove return bool in SurfaceOzoneEGL::OnSwapBuffersAsync

ui/ozone/public/surface_ozone_egl.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 UI_OZONE_PUBLIC_SURFACE_OZONE_EGL_H_
 #define UI_OZONE_PUBLIC_SURFACE_OZONE_EGL_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 28 matching lines @@
   virtual bool ResizeNativeWindow(const gfx::Size& viewport_size) = 0;
 
   // Called after we swap buffers. This is usually a no-op but can
   // be used to present the new front buffer if the platform requires this.
   virtual bool OnSwapBuffers() = 0;
 
   // Called after we swap buffers. This is usually a no-op but can
   // be used to present the new front buffer if the platform requires this.
   // The callback should be run on the calling thread
   // (i.e. same thread SwapBuffersAsync is called).
-  virtual bool OnSwapBuffersAsync(const SwapCompletionCallback& callback) = 0;
+  virtual void OnSwapBuffersAsync(const SwapCompletionCallback& callback) = 0;
 
   // Returns a gfx::VsyncProvider for this surface. Note that this may be
   // called after we have entered the sandbox so if there are operations (e.g.
   // opening a file descriptor providing vsync events) that must be done
   // outside of the sandbox, they must have been completed in
   // InitializeHardware. Returns an empty scoped_ptr on error.
   virtual scoped_ptr<gfx::VSyncProvider> CreateVSyncProvider() = 0;
 
   // Returns true if the surface is created on a UDL device.
   virtual bool IsUniversalDisplayLinkDevice();
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_SURFACE_OZONE_EGL_H_