Respect the disabled extension list during binding initialization.

ui/gl/gl_bindings_autogen_glx.cc

 // 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.
 //
 // This file is auto-generated from
 // ui/gl/generate_bindings.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 114 matching lines @@
   ext.b_GLX_MESA_copy_sub_buffer =
       extensions.find("GLX_MESA_copy_sub_buffer ") != std::string::npos;
   ext.b_GLX_MESA_swap_control =
       extensions.find("GLX_MESA_swap_control ") != std::string::npos;
   ext.b_GLX_OML_sync_control =
       extensions.find("GLX_OML_sync_control ") != std::string::npos;
   ext.b_GLX_SGIX_fbconfig =
       extensions.find("GLX_SGIX_fbconfig ") != std::string::npos;
   ext.b_GLX_SGI_video_sync =
       extensions.find("GLX_SGI_video_sync ") != std::string::npos;
-
   debug_fn.glXBindTexImageEXTFn = 0;
   if (ext.b_GLX_EXT_texture_from_pixmap) {
     fn.glXBindTexImageEXTFn = reinterpret_cast<glXBindTexImageEXTProc>(
         GetGLProcAddress("glXBindTexImageEXT"));
     DCHECK(fn.glXBindTexImageEXTFn);
   }
 
   debug_fn.glXCopySubBufferMESAFn = 0;
   if (ext.b_GLX_MESA_copy_sub_buffer) {
     fn.glXCopySubBufferMESAFn = reinterpret_cast<glXCopySubBufferMESAProc>(
@@ skipping 1363 matching lines @@
   TRACE_EVENT_BINARY_EFFICIENT0("gpu", "TraceGLAPI::glXWaitVideoSyncSGI")
   return glx_api_->glXWaitVideoSyncSGIFn(divisor, remainder, count);
 }
 
 void TraceGLXApi::glXWaitXFn(void) {
   TRACE_EVENT_BINARY_EFFICIENT0("gpu", "TraceGLAPI::glXWaitX")
   glx_api_->glXWaitXFn();
 }
 
 }  // namespace gfx