Respect the disabled extension list during binding initialization.

ui/gl/gl_bindings_autogen_glx.cc

Index: ui/gl/gl_bindings_autogen_glx.cc
diff --git a/ui/gl/gl_bindings_autogen_glx.cc b/ui/gl/gl_bindings_autogen_glx.cc
index ca36b7aa00c18877cbe10e2086419dc4c9f1e6ee..c8cec26831ed5578428fbeddcb699ba05cf95a72 100644
--- a/ui/gl/gl_bindings_autogen_glx.cc
+++ b/ui/gl/gl_bindings_autogen_glx.cc
@@ -112,27 +112,32 @@ void DriverGLX::InitializeStaticBindings() {
       reinterpret_cast<glXWaitGLProc>(GetGLProcAddress("glXWaitGL"));
   fn.glXWaitVideoSyncSGIFn = 0;
   fn.glXWaitXFn = reinterpret_cast<glXWaitXProc>(GetGLProcAddress("glXWaitX"));
-  std::string extensions(GetPlatformExtensions());
-  extensions += " ";
-  ALLOW_UNUSED_LOCAL(extensions);
+}
 
+void DriverGLX::InitializeExtensionBindings(
+    const std::set<std::string>& enabled_extensions) {
   ext.b_GLX_ARB_create_context =
-      extensions.find("GLX_ARB_create_context ") != std::string::npos;
+      enabled_extensions.find("GLX_ARB_create_context") !=
+      enabled_extensions.end();
   ext.b_GLX_EXT_swap_control =
-      extensions.find("GLX_EXT_swap_control ") != std::string::npos;
+      enabled_extensions.find("GLX_EXT_swap_control") !=
+      enabled_extensions.end();
   ext.b_GLX_EXT_texture_from_pixmap =
-      extensions.find("GLX_EXT_texture_from_pixmap ") != std::string::npos;
+      enabled_extensions.find("GLX_EXT_texture_from_pixmap") !=
+      enabled_extensions.end();
   ext.b_GLX_MESA_copy_sub_buffer =
-      extensions.find("GLX_MESA_copy_sub_buffer ") != std::string::npos;
+      enabled_extensions.find("GLX_MESA_copy_sub_buffer") !=
+      enabled_extensions.end();
   ext.b_GLX_MESA_swap_control =
-      extensions.find("GLX_MESA_swap_control ") != std::string::npos;
+      enabled_extensions.find("GLX_MESA_swap_control") !=
+      enabled_extensions.end();
   ext.b_GLX_OML_sync_control =
-      extensions.find("GLX_OML_sync_control ") != std::string::npos;
+      enabled_extensions.find("GLX_OML_sync_control") !=
+      enabled_extensions.end();
   ext.b_GLX_SGIX_fbconfig =
-      extensions.find("GLX_SGIX_fbconfig ") != std::string::npos;
+      enabled_extensions.find("GLX_SGIX_fbconfig") != enabled_extensions.end();
   ext.b_GLX_SGI_video_sync =
-      extensions.find("GLX_SGI_video_sync ") != std::string::npos;
-
+      enabled_extensions.find("GLX_SGI_video_sync") != enabled_extensions.end();
   debug_fn.glXBindTexImageEXTFn = 0;
   if (ext.b_GLX_EXT_texture_from_pixmap) {
     fn.glXBindTexImageEXTFn = reinterpret_cast<glXBindTexImageEXTProc>(