Revert of Enable iPad Tab Switcher by default on iOS.

ios/chrome/ios_chrome.gyp

 # Copyright 2014 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,
   },
   'targets': [
     {
@@ skipping 496 matching lines @@
         'browser/signin/signin_error_controller_factory.h',
         'browser/signin/signin_manager_factory.cc',
         'browser/signin/signin_manager_factory.h',
         'browser/signin/signin_manager_factory_observer.h',
         'browser/signin/signin_util.h',
         'browser/signin/signin_util.mm',
         'browser/snapshots/lru_cache.h',
         'browser/snapshots/lru_cache.mm',
         'browser/snapshots/snapshot_cache.h',
         'browser/snapshots/snapshot_cache.mm',
-        'browser/snapshots/snapshot_cache_internal.h',
         'browser/snapshots/snapshot_manager.h',
         'browser/snapshots/snapshot_manager.mm',
         'browser/snapshots/snapshot_overlay.h',
         'browser/snapshots/snapshot_overlay.mm',
         'browser/snapshots/snapshots_util.h',
         'browser/snapshots/snapshots_util.mm',
         'browser/ssl/ios_chrome_security_state_model_client.h',
         'browser/ssl/ios_chrome_security_state_model_client.mm',
         'browser/ssl/ios_ssl_blocking_page.h',
         'browser/ssl/ios_ssl_blocking_page.mm',
@@ skipping 355 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/safe_browsing',
             'proto_out_dir': 'ios/chrome/browser/safe_browsing',
           },
           'includes': [ '../../build/protoc.gypi' ],
         },
       ],
     }],
   ],
 }