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 94 matching lines @@
   fn.glXSwapBuffersFn =
       reinterpret_cast<glXSwapBuffersProc>(GetGLProcAddress("glXSwapBuffers"));
   fn.glXSwapIntervalEXTFn = 0;
   fn.glXSwapIntervalMESAFn = 0;
   fn.glXUseXFontFn =
       reinterpret_cast<glXUseXFontProc>(GetGLProcAddress("glXUseXFont"));
   fn.glXWaitGLFn =
       reinterpret_cast<glXWaitGLProc>(GetGLProcAddress("glXWaitGL"));
   fn.glXWaitVideoSyncSGIFn = 0;
   fn.glXWaitXFn = reinterpret_cast<glXWaitXProc>(GetGLProcAddress("glXWaitX"));
+}
+
+void DriverGLX::InitializeExtensionBindings() {
   std::string extensions(GetPlatformExtensions());
   extensions += " ";
   ALLOW_UNUSED_LOCAL(extensions);
 
   ext.b_GLX_ARB_create_context =
       extensions.find("GLX_ARB_create_context ") != std::string::npos;
   ext.b_GLX_EXT_swap_control =
       extensions.find("GLX_EXT_swap_control ") != std::string::npos;
   ext.b_GLX_EXT_texture_from_pixmap =
       extensions.find("GLX_EXT_texture_from_pixmap ") != std::string::npos;
@@ skipping 1384 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