Initialize a few uninitialized members in GPU classes.

gpu/command_buffer/service/gles2_cmd_decoder.h

Index: gpu/command_buffer/service/gles2_cmd_decoder.h
===================================================================
--- gpu/command_buffer/service/gles2_cmd_decoder.h	(revision 79379)
+++ gpu/command_buffer/service/gles2_cmd_decoder.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -26,6 +26,8 @@
 class GLES2Util;
 
 struct DisallowedExtensions {
+  DisallowedExtensions() : multisampling(false) {}
+
   bool multisampling;
 };