Revert 158076 - Implement blacklist's force GPU capability in dual GPU machines.

ui/gl/gl_context_mac.mm

 // 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 "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/mesa/MesaLib/include/GL/osmesa.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context_cgl.h"
 #include "ui/gl/gl_context_osmesa.h"
 #include "ui/gl/gl_context_stub.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface.h"
 #include "ui/gl/gl_switches.h"
-#include "ui/gl/gpu_switching_manager.h"
 
 #if defined(USE_AURA)
 #include "ui/gl/gl_context_nsview.h"
 #endif
 
 namespace gfx {
 
 class GLShareGroup;
 
 scoped_refptr<GLContext> GLContext::CreateGLContext(
@@ skipping 120 matching lines @@
 
     const int kMacBookProFirstDualAMDIntelGPUModel = 8;
 
     // Do not overwrite commandline switches to honor a user's decision.
     bool forcibly_disable =
         ((model == "MacBookPro") &&
          (model_major < kMacBookProFirstDualAMDIntelGPUModel)) &&
         !CommandLine::ForCurrentProcess()->HasSwitch(switches::kGpuSwitching);
 
     if (forcibly_disable) {
-      GpuSwitchingManager::GetInstance()->ForceUseOfDiscreteGpu();
+      GLContextCGL::ForceUseOfDiscreteGPU();
       return false;
     }
 
     supports_dual_gpus = true;
   }
 
   return supports_dual_gpus;
 }
 
 }  // namespace gfx