Make dynamic mock bindings initialization consistent with other GL implementations

ui/gl/gl_implementation_win.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.
 
 #include "ui/gl/gl_implementation.h"
 
 #include "ui/gl/gl_context_stub_with_extensions.h"
 #include "ui/gl/gl_egl_api_implementation.h"
 #include "ui/gl/gl_gl_api_implementation.h"
 #include "ui/gl/gl_osmesa_api_implementation.h"
 #include "ui/gl/gl_wgl_api_implementation.h"
 
 namespace gl {
 
 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
   impls->push_back(kGLImplementationEGLGLES2);
   impls->push_back(kGLImplementationDesktopGL);
   impls->push_back(kGLImplementationOSMesaGL);
 }
 
-bool InitializeDynamicGLBindings(GLImplementation implementation,
-    GLContext* context) {
-  switch (implementation) {
-    case kGLImplementationOSMesaGL:
-    case kGLImplementationEGLGLES2:
-    case kGLImplementationDesktopGL:
-      InitializeDynamicGLBindingsGL(context);
-      break;
-    case kGLImplementationMockGL:
-      if (!context) {
-        scoped_refptr<GLContextStubWithExtensions> mock_context(
-            new GLContextStubWithExtensions());
-        mock_context->SetGLVersionString("3.0");
-        InitializeDynamicGLBindingsGL(mock_context.get());
-      } else {
-        InitializeDynamicGLBindingsGL(context);
-      }
-      break;
-    default:
-      return false;
-  }
-
-  return true;
-}
-
 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
   switch (GetGLImplementation()) {
     case kGLImplementationDesktopGL:
       return GetGLWindowSystemBindingInfoWGL(info);
     case kGLImplementationEGLGLES2:
       return GetGLWindowSystemBindingInfoEGL(info);
     default:
       return false;
   }
 }
 
 }  // namespace gl