Kill PropertyBag, switch WebContents to SupportsUserData.

base/base.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 293 matching lines @@
           'process_util_openbsd.cc',
           'process_util_posix.cc',
           'process_util_win.cc',
           'process_win.cc',
           'profiler/scoped_profile.cc',
           'profiler/scoped_profile.h',
           'profiler/alternate_timer.cc',
           'profiler/alternate_timer.h',
           'profiler/tracked_time.cc',
           'profiler/tracked_time.h',
-          'property_bag.cc',
-          'property_bag.h',
           'rand_util.cc',
           'rand_util.h',
           'rand_util_nacl.cc',
           'rand_util_posix.cc',
           'rand_util_win.cc',
           'run_loop.cc',
           'run_loop.h',
           'safe_strerror_posix.cc',
           'safe_strerror_posix.h',
           'scoped_native_library.cc',
@@ skipping 355 matching lines @@
           # Remove all unnecessary files for build_nexe.py to avoid exceeding
           # command-line-string limitation when building NaCl on Windows.
           ['OS == "win" and >(nacl_untrusted_build)==1', {
               'sources/': [ ['exclude', '\\.h$'] ],
           }],
         ],
       }],
     ],
   },
 }