Mac: Don't CHECK that AcquireIOSurface succeeds

content/common/mac/io_surface_manager_messages.h

 // Copyright 2015 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_COMMON_MAC_IO_SURFACE_MANAGER_MESSAGES_H_
 #define CONTENT_COMMON_MAC_IO_SURFACE_MANAGER_MESSAGES_H_
 
 #include <mach/message.h>
 
 #include "content/common/mac/io_surface_manager_token.h"
@@ skipping 41 matching lines @@
 struct IOSurfaceManagerMsg_RegisterIOSurfaceReply {
   mach_msg_header_t header;
   mach_msg_body_t body;
   boolean_t result;
 };
 
 struct IOSurfaceManagerMsg_AcquireIOSurfaceReply {
   mach_msg_header_t header;
   mach_msg_body_t body;
   mach_msg_port_descriptor_t io_surface_port;
+  boolean_t result;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_MAC_IO_SURFACE_MANAGER_MESSAGES_H_