Android: Don't destroy LayerTreeHost when Surface goes away

ui/android/ui_android.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       # GN version: //ui/android
       'target_name': 'ui_android',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../cc/cc.gyp:cc',
         '../../skia/skia.gyp:skia',
         '../gfx/gfx.gyp:gfx',
         '../gfx/gfx.gyp:gfx_geometry',
+        '../../testing/gmock.gyp:gmock',
         'ui_android_jni_headers',
       ],
       'defines': [
         'UI_ANDROID_IMPLEMENTATION',
       ],
       'sources' : [
         'resources/resource_manager.cc',
         'resources/resource_manager.h',
         'resources/resource_manager_impl.cc',
         'resources/resource_manager_impl.h',
-        'resources/ui_resource_android.cc',
-        'resources/ui_resource_android.h',
-        'resources/ui_resource_client_android.h',
-        'resources/ui_resource_provider.cc',
         'resources/ui_resource_provider.h',
         'ui_android_export.h',
         'ui_android_jni_registrar.cc',
         'ui_android_jni_registrar.h',
         'view_android.cc',
         'view_android.h',
         'window_android.cc',
         'window_android.h',
         'window_android_compositor.h',
         'window_android_observer.h',
@@ skipping 162 matching lines @@
             ],
             'sources': [
               'ui_android_unittests_apk.isolate',
             ],
           },
         ]
       }
     ],
   ]
 }