Revert of Add isnan() workaround for Intel Mac

gpu/config/gpu_driver_bug_list_json.cc

 // Copyright (c) 2013 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.
 
 // Determines whether a certain driver bug exists in the current system.
 // The format of a valid gpu_driver_bug_list.json file is defined in
 // <gpu/config/gpu_control_list_format.txt>.
 // The supported "features" can be found in
 // <gpu/config/gpu_driver_bug_workaround_type.h>.
 
@@ skipping 2009 matching lines @@
       "description": "Disable partial swaps on Mesa drivers (detected with GL_VERSION)",
       "cr_bugs": [339493],
       "os": {
         "type": "linux"
       },
       "gl_type": "gl",
       "gl_version_string": ".*Mesa.*",
       "features": [
         "disable_post_sub_buffers_for_onscreen_surfaces"
       ]
-    },
-    {
-      "id": 191,
-      "description": "Emulate GLSL function isnan() on Intel Mac",
-      "cr_bugs": [650547],
-      "os": {
-        "type": "macosx"
-      },
-      "vendor_id": "0x8086",
-      "device_id" : [
-        "0x1902", "0x1906", "0x190A", "0x190B", "0x190E", "0x1912", "0x1913", "0x1915",
-        "0x1916", "0x1917", "0x191A", "0x191B", "0x191D", "0x191E", "0x1921", "0x1923",
-        "0x1926", "0x1927", "0x192A", "0x192B", "0x192D", "0x1932", "0x193A", "0x193B",
-        "0x193D"
-      ],
-      "features" : [
-        "emulate_isnan_on_float"
-      ]
     }
   ]
   // Please update the version number at beginning of this file whenever you
   // change this file.
 }
 
 );  // LONG_STRING_CONST macro
 
 }  // namespace gpu