Extract ProcessManager from ExtensionSystem.

extensions/browser/extension_message_filter.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/extension_message_filter.h"
 
 #include "components/crx_file/id_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
@@ skipping 232 matching lines @@
     return;
   EventRouter* router = EventRouter::Get(browser_context_);
   if (!router)
     return;
   router->RemoveFilteredEventListener(
       event_name, process, extension_id, filter, lazy);
 }
 
 void ExtensionMessageFilter::OnExtensionShouldSuspendAck(
      const std::string& extension_id, int sequence_id) {
-  ProcessManager* process_manager =
-      ExtensionSystem::Get(browser_context_)->process_manager();
-  if (process_manager)
-    process_manager->OnShouldSuspendAck(extension_id, sequence_id);
+  ProcessManager::Get(browser_context_)
+      ->OnShouldSuspendAck(extension_id, sequence_id);
 }
 
 void ExtensionMessageFilter::OnExtensionSuspendAck(
      const std::string& extension_id) {
-  ProcessManager* process_manager =
-      ExtensionSystem::Get(browser_context_)->process_manager();
-  if (process_manager)
-    process_manager->OnSuspendAck(extension_id);
+  ProcessManager::Get(browser_context_)->OnSuspendAck(extension_id);
 }
 
 void ExtensionMessageFilter::OnExtensionTransferBlobsAck(
     const std::vector<std::string>& blob_uuids) {
   RenderProcessHost* process = RenderProcessHost::FromID(render_process_id_);
   if (!process)
     return;
   BlobHolder::FromRenderProcessHost(process)->DropBlobs(blob_uuids);
 }
 
@@ skipping 50 matching lines @@
                        guest_instance_id,
                        attach_params);
 
   IPC::Message* msg =
       new ExtensionMsg_CreateMimeHandlerViewGuestACK(element_instance_id);
   msg->set_routing_id(rfh->GetRoutingID());
   rfh->Send(msg);
 }
 
 }  // namespace extensions