Refactor GL bindings so there is no global GLApi or DriverGL.

ui/gl/gl_context_wgl.cc

 // Copyright (c) 2012 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 implements the GLContextWGL and PbufferGLContext classes.
 
 #include "ui/gl/gl_context_wgl.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 87 matching lines @@
 
   ScopedReleaseCurrent release_current;
   TRACE_EVENT0("gpu", "GLContextWGL::MakeCurrent");
 
   if (!wglMakeCurrent(static_cast<HDC>(surface->GetHandle()), context_)) {
     LOG(ERROR) << "Unable to make gl context current.";
     return false;
   }
 
   // Set this as soon as the context is current, since we might call into GL.
-  SetRealGLApi();
+  BindGLApi();
 
   SetCurrent(surface);
   InitializeDynamicBindings();
 
   if (!surface->OnMakeCurrent(this)) {
     LOG(ERROR) << "Could not make current.";
     return false;
   }
 
   release_current.Cancel();
@@ skipping 54 matching lines @@
     return GLContext::GetExtensions() + " " + extensions;
 
   return GLContext::GetExtensions();
 }
 
 GLContextWGL::~GLContextWGL() {
   Destroy();
 }
 
 }  // namespace gl