Respect the disabled extension list during binding initialization.

ui/gl/gl_bindings_autogen_wgl.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 37 matching lines @@
   fn.wglGetPbufferDCARBFn = 0;
   fn.wglMakeCurrentFn =
       reinterpret_cast<wglMakeCurrentProc>(GetGLProcAddress("wglMakeCurrent"));
   fn.wglQueryPbufferARBFn = 0;
   fn.wglReleasePbufferDCARBFn = 0;
   fn.wglShareListsFn =
       reinterpret_cast<wglShareListsProc>(GetGLProcAddress("wglShareLists"));
   fn.wglSwapIntervalEXTFn = 0;
   fn.wglSwapLayerBuffersFn = reinterpret_cast<wglSwapLayerBuffersProc>(
       GetGLProcAddress("wglSwapLayerBuffers"));
+}
+
+void DriverWGL::InitializeExtensionBindings() {
   std::string extensions(GetPlatformExtensions());
   extensions += " ";
   ALLOW_UNUSED_LOCAL(extensions);
 
   ext.b_WGL_ARB_extensions_string =
       extensions.find("WGL_ARB_extensions_string ") != std::string::npos;
   ext.b_WGL_ARB_pbuffer =
       extensions.find("WGL_ARB_pbuffer ") != std::string::npos;
   ext.b_WGL_ARB_pixel_format =
       extensions.find("WGL_ARB_pixel_format ") != std::string::npos;
@@ skipping 498 matching lines @@
   TRACE_EVENT_BINARY_EFFICIENT0("gpu", "TraceGLAPI::wglSwapIntervalEXT")
   return wgl_api_->wglSwapIntervalEXTFn(interval);
 }
 
 BOOL TraceWGLApi::wglSwapLayerBuffersFn(HDC hdc, UINT fuPlanes) {
   TRACE_EVENT_BINARY_EFFICIENT0("gpu", "TraceGLAPI::wglSwapLayerBuffers")
   return wgl_api_->wglSwapLayerBuffersFn(hdc, fuPlanes);
 }
 
 }  // namespace gfx