Mojo: Move the handle table details out of CoreImpl into its own class.

mojo/mojo.gyp

 # Copyright 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.
 
 {
   'target_defaults': {
     'conditions': [
       ['mojo_shell_debug_url != ""', {
         'defines': [
           'MOJO_SHELL_DEBUG=1',
@@ skipping 108 matching lines @@
         'system/core_impl.cc',
         'system/core_impl.h',
         'system/data_pipe.cc',
         'system/data_pipe.h',
         'system/data_pipe_consumer_dispatcher.cc',
         'system/data_pipe_consumer_dispatcher.h',
         'system/data_pipe_producer_dispatcher.cc',
         'system/data_pipe_producer_dispatcher.h',
         'system/dispatcher.cc',
         'system/dispatcher.h',
+        'system/handle_table.cc',
+        'system/handle_table.h',
         'system/local_data_pipe.cc',
         'system/local_data_pipe.h',
         'system/local_message_pipe_endpoint.cc',
         'system/local_message_pipe_endpoint.h',
         'system/memory.cc',
         'system/memory.h',
         'system/message_in_transit.cc',
         'system/message_in_transit.h',
         'system/message_in_transit_queue.cc',
         'system/message_in_transit_queue.h',
@@ skipping 465 matching lines @@
             'mojo_js_unittests.isolate',
           ],
           'sources': [
             'mojo_js_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }