Add missing dependencies to extensions BUILD.gns

extensions/browser/guest_view/web_view/BUILD.gn

 # Copyright 2016 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.
 
 source_set("web_view") {
   sources = [
     "javascript_dialog_helper.cc",
     "javascript_dialog_helper.h",
     "web_view_constants.cc",
     "web_view_constants.h",
     "web_view_content_script_manager.cc",
     "web_view_content_script_manager.h",
     "web_view_find_helper.cc",
     "web_view_find_helper.h",
     "web_view_guest.cc",
     "web_view_guest.h",
     "web_view_guest_delegate.h",
     "web_view_permission_helper.cc",
     "web_view_permission_helper.h",
     "web_view_permission_helper_delegate.cc",
     "web_view_permission_helper_delegate.h",
     "web_view_permission_types.h",
     "web_view_renderer_state.cc",
     "web_view_renderer_state.h",
   ]
 
   deps = [
     "//content/public/common",
+    "//extensions/common/api",
   ]
 }