Extract ProcessManager from ExtensionSystem.

extensions/browser/guest_view/app_view/app_view_guest.cc

 // Copyright 2014 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 "extensions/browser/guest_view/app_view/app_view_guest.h"
 
 #include "base/command_line.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/common/renderer_preferences.h"
 #include "extensions/browser/api/app_runtime/app_runtime_api.h"
@@ skipping 167 matching lines @@
     queue->AddPendingTask(browser_context(),
                           guest_extension->id(),
                           base::Bind(
                               &AppViewGuest::LaunchAppAndFireEvent,
                               weak_ptr_factory_.GetWeakPtr(),
                               base::Passed(make_scoped_ptr(data->DeepCopy())),
                               callback));
     return;
   }
 
-  ProcessManager* process_manager =
-      ExtensionSystem::Get(browser_context())->process_manager();
+  ProcessManager* process_manager = ProcessManager::Get(browser_context());
   ExtensionHost* host =
       process_manager->GetBackgroundHostForExtension(guest_extension->id());
   DCHECK(host);
   LaunchAppAndFireEvent(make_scoped_ptr(data->DeepCopy()), callback, host);
 }
 
 void AppViewGuest::DidAttachToEmbedder() {
   // This is called after the guest process has been attached to a host
   // element. This means that the host element knows how to route input
   // events to the guest, and the guest knows how to get frames to the
@@ skipping 50 matching lines @@
 
   scoped_ptr<base::DictionaryValue> embed_request(new base::DictionaryValue());
   embed_request->SetInteger(appview::kGuestInstanceID, guest_instance_id());
   embed_request->SetString(appview::kEmbedderID, embedder_extension_id());
   embed_request->Set(appview::kData, data.release());
   AppRuntimeEventRouter::DispatchOnEmbedRequestedEvent(
       browser_context(), embed_request.Pass(), extension_host->extension());
 }
 
 }  // namespace extensions