Move <webview> API to chrome layer

chrome/chrome_browser.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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 350 matching lines @@
         'browser/bookmarks/bookmark_prompt_prefs.cc',
         'browser/bookmarks/bookmark_prompt_prefs.h',
         'browser/bookmarks/bookmark_storage.cc',
         'browser/bookmarks/bookmark_storage.h',
         'browser/bookmarks/bookmark_utils.cc',
         'browser/bookmarks/bookmark_utils.h',
         'browser/bookmarks/recently_used_folders_combo_model.cc',
         'browser/bookmarks/recently_used_folders_combo_model.h',
         'browser/browser_about_handler.cc',
         'browser/browser_about_handler.h',
+        'browser/browser_plugin/chrome_browser_plugin_guest_observer.cc',
+        'browser/browser_plugin/chrome_browser_plugin_guest_observer.h',
         'browser/browser_process.cc',
         'browser/browser_process.h',
         'browser/browser_process_impl.cc',
         'browser/browser_process_impl.h',
         'browser/browser_process_impl_win.cc',
         'browser/browser_shutdown.cc',
         'browser/browser_shutdown.h',
         'browser/browser_util_win.cc',
         'browser/browser_util_win.h',
         'browser/browsing_data/browsing_data_appcache_helper.cc',
@@ skipping 2760 matching lines @@
           'variables': {
             'jni_gen_dir': 'chrome',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
       ],
      },
     ],
   ],
 }