Abstract base 'ExtensionView' to Fix DEPS violation in extension_view_host.h

chrome/chrome_browser_ui.gypi

 # Copyright 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': {
     'chrome_browser_ui_non_ios_sources': [
       'browser/ui/accelerator_utils.h',
       'browser/ui/android/android_about_app_info.cc',
       'browser/ui/android/android_about_app_info.h',
@@ skipping 24 matching lines @@
       'browser/ui/android/certificate_viewer_android.cc',
       'browser/ui/android/chrome_http_auth_handler.cc',
       'browser/ui/android/chrome_http_auth_handler.h',
       'browser/ui/android/color_chooser_dialog_android.cc',
       'browser/ui/android/context_menu_helper.cc',
       'browser/ui/android/context_menu_helper.h',
       'browser/ui/android/extensions/extension_install_dialog_android.cc',
       'browser/ui/android/extensions/extension_install_ui_android.cc',
       'browser/ui/android/extensions/extension_install_ui_android.h',
       'browser/ui/android/extensions/extension_view_android.cc',
-      'browser/ui/android/extensions/extension_view_android.h',
       'browser/ui/android/external_protocol_dialog_android.cc',
       'browser/ui/android/javascript_app_modal_dialog_android.cc',
       'browser/ui/android/login_prompt_android.cc',
       'browser/ui/android/navigation_popup.cc',
       'browser/ui/android/navigation_popup.h',
       'browser/ui/android/omnibox/omnibox_view_util.cc',
       'browser/ui/android/omnibox/omnibox_view_util.h',
       'browser/ui/android/simple_message_box_android.cc',
       'browser/ui/android/ssl_client_certificate_request.cc',
       'browser/ui/android/ssl_client_certificate_request.h',
@@ skipping 2882 matching lines @@
         }],
         ['enable_spellcheck==1', {
           'dependencies': [
             '../third_party/hunspell/hunspell.gyp:hunspell',
           ],
         }],
       ],
     },
   ],
 }