Only support left/right maximizing at 50% width when the --ash-enable-alternate-caption-button

ash/ash.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,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 499 matching lines @@
         'wm/workspace/frame_caption_button_container_view.h',
         'wm/workspace/frame_maximize_button.cc',
         'wm/workspace/frame_maximize_button.h',
         'wm/workspace/magnetism_matcher.cc',
         'wm/workspace/magnetism_matcher.h',
         'wm/workspace/maximize_bubble_frame_state.h',
         'wm/workspace/multi_window_resize_controller.cc',
         'wm/workspace/multi_window_resize_controller.h',
         'wm/workspace/phantom_window_controller.cc',
         'wm/workspace/phantom_window_controller.h',
-        'wm/workspace/snap_sizer.cc',
-        'wm/workspace/snap_sizer.h',
         'wm/workspace/snap_types.h',
         'wm/workspace/workspace_event_handler.cc',
         'wm/workspace/workspace_event_handler.h',
         'wm/workspace/workspace_layout_manager.cc',
         'wm/workspace/workspace_layout_manager.h',
         'wm/workspace/workspace_types.h',
         'wm/workspace/workspace_window_resizer.cc',
         'wm/workspace/workspace_window_resizer.h',
       ],
       'conditions': [
@@ skipping 395 matching lines @@
             'shell/cocoa/app-Info.plist',
           ],
           'xcode_settings': {
             'INFOPLIST_FILE': 'shell/cocoa/app-Info.plist',
           },
         }],
       ],
     },
   ],
 }