Respect the disabled extension list during binding initialization.

ui/gl/gl_glx_api_implementation.cc

 // Copyright (c) 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.
 
 #include "ui/gl/gl_glx_api_implementation.h"
 #include "ui/gl/gl_implementation.h"
 
 namespace gfx {
 
 RealGLXApi* g_real_glx;
 
 void InitializeStaticGLBindingsGLX() {
   g_driver_glx.InitializeStaticBindings();
   if (!g_real_glx) {
     g_real_glx = new RealGLXApi();
   }
   g_real_glx->Initialize(&g_driver_glx);
   g_current_glx_context = g_real_glx;
+  g_driver_glx.InitializeExtensionBindings();
 }
 
 void InitializeDebugGLBindingsGLX() {
   g_driver_glx.InitializeDebugBindings();
 }
 
 void ClearGLBindingsGLX() {
   if (g_real_glx) {
     delete g_real_glx;
     g_real_glx = NULL;
@@ skipping 48 matching lines @@
     info->version = version;
   if (extensions)
     info->extensions = extensions;
   info->direct_rendering = !!glXIsDirect(display, glXGetCurrentContext());
   return true;
 }
 
 }  // namespace gfx