Extract ProcessManager from ExtensionSystem.

chrome/browser/extensions/extension_service.cc

 // Copyright (c) 2013 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 "chrome/browser/extensions/extension_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 
@@ skipping 580 matching lines @@
   std::string extension_id = transient_extension_id;
   const Extension* transient_current_extension =
       GetExtensionById(extension_id, false);
 
   // Disable the extension if it's loaded. It might not be loaded if it crashed.
   if (transient_current_extension) {
     // If the extension has an inspector open for its background page, detach
     // the inspector and hang onto a cookie for it, so that we can reattach
     // later.
     // TODO(yoz): this is not incognito-safe!
-    extensions::ProcessManager* manager = system_->process_manager();
+    extensions::ProcessManager* manager =
+        extensions::ProcessManager::Get(profile_);
     extensions::ExtensionHost* host =
         manager->GetBackgroundHostForExtension(extension_id);
     if (host && DevToolsAgentHost::HasFor(host->host_contents())) {
       // Look for an open inspector for the background page.
       scoped_refptr<DevToolsAgentHost> agent_host =
           DevToolsAgentHost::GetOrCreateFor(host->host_contents());
       agent_host->DisconnectWebContents();
       orphaned_dev_tools_[extension_id] = agent_host;
     }
 
@@ skipping 1758 matching lines @@
 }
 
 void ExtensionService::OnProfileDestructionStarted() {
   ExtensionIdSet ids_to_unload = registry_->enabled_extensions().GetIDs();
   for (ExtensionIdSet::iterator it = ids_to_unload.begin();
        it != ids_to_unload.end();
        ++it) {
     UnloadExtension(*it, UnloadedExtensionInfo::REASON_PROFILE_SHUTDOWN);
   }
 }