Extract ProcessManager from ExtensionSystem.

extensions/browser/extension_host.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_host.h"
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 331 matching lines @@
   extension_function_dispatcher_.Dispatch(params, render_view_host());
 }
 
 void ExtensionHost::OnEventAck() {
   EventRouter* router = EventRouter::Get(browser_context_);
   if (router)
     router->OnEventAck(browser_context_, extension_id());
 }
 
 void ExtensionHost::OnIncrementLazyKeepaliveCount() {
-  ProcessManager* pm = ExtensionSystem::Get(
-      browser_context_)->process_manager();
-  if (pm)
-    pm->IncrementLazyKeepaliveCount(extension());
+  ProcessManager::Get(browser_context_)
+      ->IncrementLazyKeepaliveCount(extension());
 }
 
 void ExtensionHost::OnDecrementLazyKeepaliveCount() {
-  ProcessManager* pm = ExtensionSystem::Get(
-      browser_context_)->process_manager();
-  if (pm)
-    pm->DecrementLazyKeepaliveCount(extension());
+  ProcessManager::Get(browser_context_)
+      ->DecrementLazyKeepaliveCount(extension());
 }
 
 // content::WebContentsObserver
 
 void ExtensionHost::RenderViewCreated(RenderViewHost* render_view_host) {
   render_view_host_ = render_view_host;
 }
 
 void ExtensionHost::RenderViewDeleted(RenderViewHost* render_view_host) {
   // If our RenderViewHost is deleted, fall back to the host_contents' current
@@ skipping 62 matching lines @@
   return delegate_->CheckMediaAccessPermission(
       web_contents, security_origin, type, extension());
 }
 
 bool ExtensionHost::IsNeverVisible(content::WebContents* web_contents) {
   ViewType view_type = extensions::GetViewType(web_contents);
   return view_type == extensions::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE;
 }
 
 }  // namespace extensions