Extract shell methods from ApplicationImpl into a base class, and pass this to Initialize() instead.

components/web_view/pending_web_view_load.cc

 // Copyright 2015 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.
 
 #include "components/web_view/pending_web_view_load.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "components/web_view/frame_connection.h"
 #include "components/web_view/web_view_impl.h"
 
 namespace web_view {
 
 PendingWebViewLoad::PendingWebViewLoad(WebViewImpl* web_view)
     : web_view_(web_view), is_content_handler_id_valid_(false) {}
 
 PendingWebViewLoad::~PendingWebViewLoad() {}
 
 void PendingWebViewLoad::Init(mojo::URLRequestPtr request) {
   DCHECK(!frame_connection_);
   pending_url_ = GURL(request->url.get());
   navigation_start_time_ =
       base::TimeTicks::FromInternalValue(request->originating_time_ticks);
   frame_connection_.reset(new FrameConnection);
-  frame_connection_->Init(web_view_->app_, std::move(request),
+  frame_connection_->Init(web_view_->shell_, std::move(request),
                           base::Bind(&PendingWebViewLoad::OnGotContentHandlerID,
                                      base::Unretained(this)));
 }
 
 void PendingWebViewLoad::OnGotContentHandlerID() {
   is_content_handler_id_valid_ = true;
   if (web_view_->root_)
     web_view_->OnLoad(pending_url_);
   // The else case is handled by WebViewImpl when it gets the Window (|root_|).
 }
 
 }  // namespace web_view