base: Move MemoryMappedFile out of file_util.h and into its own header file.

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 150 matching lines @@
           'files/file_path_watcher.cc',
           'files/file_path_watcher.h',
           'files/file_path_watcher_kqueue.cc',
           'files/file_path_watcher_linux.cc',
           'files/file_path_watcher_stub.cc',
           'files/file_path_watcher_win.cc',
           'files/file_util_proxy.cc',
           'files/file_util_proxy.h',
           'files/important_file_writer.h',
           'files/important_file_writer.cc',
+          'files/memory_mapped_file.cc',
+          'files/memory_mapped_file.h',
+          'files/memory_mapped_file_posix.cc',
+          'files/memory_mapped_file_win.cc',
           'files/scoped_temp_dir.cc',
           'files/scoped_temp_dir.h',
           'float_util.h',
           'format_macros.h',
           'gtest_prod_util.h',
           'guid.cc',
           'guid.h',
           'guid_posix.cc',
           'guid_win.cc',
           'hash.cc',
@@ skipping 578 matching lines @@
           ['<(use_system_nspr)==1 and >(nacl_untrusted_build)==0', {
             'sources/': [
               ['exclude', '^third_party/nspr/'],
             ],
           }],
         ],
       }],
     ],
   },
 }