Make GL bindings conditional

ui/gl/gl_bindings_autogen_osmesa.cc

Index: ui/gl/gl_bindings_autogen_osmesa.cc
diff --git a/ui/gl/gl_bindings_autogen_osmesa.cc b/ui/gl/gl_bindings_autogen_osmesa.cc
index a9ca7327f338c6fd5b0a244b9bd0d2b83e66723b..299f9f28ab2c7575858ffac97969933da3f2c181 100644
--- a/ui/gl/gl_bindings_autogen_osmesa.cc
+++ b/ui/gl/gl_bindings_autogen_osmesa.cc
@@ -46,13 +46,8 @@ void DriverOSMESA::InitializeStaticBindings() {
       GetGLProcAddress("OSMesaMakeCurrent"));
   fn.OSMesaPixelStoreFn = reinterpret_cast<OSMesaPixelStoreProc>(
       GetGLProcAddress("OSMesaPixelStore"));
-}
-
-void DriverOSMESA::InitializeDynamicBindings(GLContext* context) {
-  DCHECK(context && context->IsCurrent(NULL));
-  const GLVersionInfo* ver = context->GetVersionInfo();
-  ALLOW_UNUSED_LOCAL(ver);
-  std::string extensions = context->GetExtensions() + " ";
+  std::string extensions(GetPlatformExtensions());
+  extensions += " ";
   ALLOW_UNUSED_LOCAL(extensions);
 
   if (g_debugBindingsInitialized)