Take GL version and extensions correctly into account when binding functions

ui/gl/gl_context_osmesa.cc

Index: ui/gl/gl_context_osmesa.cc
diff --git a/ui/gl/gl_context_osmesa.cc b/ui/gl/gl_context_osmesa.cc
index cb71aa57a7e1a059ad73ef2e27cc6cfd6ccbb12a..e7ccba99039c116727f7c9f4061ad6adea717c0e 100644
--- a/ui/gl/gl_context_osmesa.cc
+++ b/ui/gl/gl_context_osmesa.cc
@@ -69,7 +69,7 @@ bool GLContextOSMesa::MakeCurrent(GLSurface* surface) {
   OSMesaPixelStore(OSMESA_Y_UP, 0);
 
   SetCurrent(surface);
-  if (!InitializeExtensionBindings()) {
+  if (!InitializeDynamicBindings()) {
     ReleaseCurrent(surface);
     return false;
   }