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

ui/gl/gl.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
 
   'targets': [
@@ skipping 58 matching lines @@
         'gl_surface_android.h',
         'gl_surface_linux.cc',
         'gl_surface_mac.cc',
         'gl_surface_stub.cc',
         'gl_surface_stub.h',
         'gl_surface_win.cc',
         'gl_surface_osmesa.cc',
         'gl_surface_osmesa.h',
         'gl_switches.cc',
         'gl_switches.h',
-        'gpu_switching_manager.cc',
-        'gpu_switching_manager.h',
         'scoped_make_current.cc',
         'scoped_make_current.h',
         '<(gl_binding_output_dir)/gl_bindings_autogen_gl.cc',
         '<(gl_binding_output_dir)/gl_bindings_autogen_gl.h',
         '<(gl_binding_output_dir)/gl_bindings_autogen_mock.cc',
         '<(gl_binding_output_dir)/gl_bindings_autogen_osmesa.cc',
         '<(gl_binding_output_dir)/gl_bindings_autogen_osmesa.h',
       ],
       # hard_dependency is necessary for this target because it has actions
       # that generate header files included by dependent targets. The header
@@ skipping 107 matching lines @@
           ],
           'defines': [
             'GL_GLEXT_PROTOTYPES',
             'EGL_EGLEXT_PROTOTYPES',
           ],
         }],
       ],
     },
   ],
 }