Update from https://crrev.com/320931

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,
       'base_i18n_target': 0,
     },
@@ skipping 300 matching lines @@
           'mac/scoped_typeref.h',
           'mac/sdk_forward_declarations.h',
           'mac/sdk_forward_declarations.mm',
           'macros.h',
           'md5.cc',
           'md5.h',
           'memory/aligned_memory.cc',
           'memory/aligned_memory.h',
           'memory/discardable_memory.cc',
           'memory/discardable_memory.h',
-          'memory/discardable_memory_android.cc',
-          'memory/discardable_memory_linux.cc',
-          'memory/discardable_memory_mac.cc',
           'memory/discardable_memory_shmem.cc',
           'memory/discardable_memory_shmem.h',
           'memory/discardable_memory_shmem_allocator.cc',
           'memory/discardable_memory_shmem_allocator.h',
-          'memory/discardable_memory_win.cc',
           'memory/discardable_shared_memory.cc',
           'memory/discardable_shared_memory.h',
           'memory/linked_ptr.h',
           'memory/manual_constructor.h',
           'memory/memory_pressure_listener.cc',
           'memory/memory_pressure_listener.h',
           'memory/raw_scoped_refptr_mismatch_checker.h',
           'memory/ref_counted.cc',
           'memory/ref_counted.h',
           'memory/ref_counted_delete_on_message_loop.h',
@@ skipping 543 matching lines @@
               ['include', '^file_version_info_mac\\.'],
               ['include', '^mac/bundle_locations\\.'],
               ['include', '^mac/foundation_util\\.'],
               ['include', '^mac/mac_logging\\.'],
               ['include', '^mac/mach_logging\\.'],
               ['include', '^mac/objc_property_releaser\\.'],
               ['include', '^mac/scoped_mach_port\\.'],
               ['include', '^mac/scoped_mach_vm\\.'],
               ['include', '^mac/scoped_nsautorelease_pool\\.'],
               ['include', '^mac/scoped_nsobject\\.'],
-              ['include', '^memory/discardable_memory_mac\\.'],
               ['include', '^message_loop/message_pump_mac\\.'],
               ['include', '^strings/sys_string_conversions_mac\\.'],
               ['include', '^threading/platform_thread_mac\\.'],
               ['include', '^time/time_mac\\.'],
               ['include', '^worker_pool_mac\\.'],
               # Exclude all process/ except the minimal implementation
               # needed on iOS (mostly for unit tests).
               ['exclude', '^process/.*'],
               ['include', '^process/.*_ios\.(cc|mm)$'],
               ['include', '^process/memory_stubs\.cc$'],
@@ skipping 133 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }