Kill PropertyBag, switch WebContents to SupportsUserData.

base/base.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,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 435 matching lines @@
         'os_compat_android_unittest.cc',
         'path_service_unittest.cc',
         'pickle_unittest.cc',
         'platform_file_unittest.cc',
         'pr_time_unittest.cc',
         'process_util_unittest.cc',
         'process_util_unittest_ios.cc',
         'process_util_unittest_mac.h',
         'process_util_unittest_mac.mm',
         'profiler/tracked_time_unittest.cc',
-        'property_bag_unittest.cc',
         'rand_util_unittest.cc',
         'scoped_native_library_unittest.cc',
         'scoped_observer.h',
         'scoped_temp_dir_unittest.cc',
         'sha1_unittest.cc',
         'shared_memory_unittest.cc',
         'stack_container_unittest.cc',
         'string16_unittest.cc',
         'string_number_conversions_unittest.cc',
         'string_piece_unittest.cc',
@@ skipping 558 matching lines @@
                 '--result', '<@(_outputs)',
                 '--isolate', 'base_unittests.isolate',
               ],
             },
           ],
         },
       ],
     }],
   ],
 }