Revert of Reparent SWProcessManager onto SWContextWrapper.

content/browser/service_worker/service_worker_process_manager.cc

Index: content/browser/service_worker/service_worker_process_manager.cc
diff --git a/content/browser/service_worker/service_worker_process_manager.cc b/content/browser/service_worker/service_worker_process_manager.cc
index 03c156be4dc064b148ae2077e530768b81d8418d..0d7b70d4b2e0c3658728daa6058c94ef0231117b 100644
--- a/content/browser/service_worker/service_worker_process_manager.cc
+++ b/content/browser/service_worker/service_worker_process_manager.cc
@@ -35,8 +35,8 @@
 }
 
 ServiceWorkerProcessManager::ServiceWorkerProcessManager(
-    BrowserContext* browser_context)
-    : browser_context_(browser_context),
+    ServiceWorkerContextWrapper* context_wrapper)
+    : context_wrapper_(context_wrapper),
       process_id_for_test_(-1),
       weak_this_factory_(this),
       weak_this_(weak_this_factory_.GetWeakPtr()) {
@@ -44,13 +44,6 @@
 
 ServiceWorkerProcessManager::~ServiceWorkerProcessManager() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  DCHECK(browser_context_ == NULL)
-      << "Call Shutdown() before destroying |this|, so that racing method "
-      << "invocations don't use a destroyed BrowserContext.";
-}
-
-void ServiceWorkerProcessManager::Shutdown() {
-  browser_context_ = NULL;
 }
 
 void ServiceWorkerProcessManager::AllocateWorkerProcess(
@@ -98,7 +91,7 @@
     }
   }
 
-  if (!browser_context_) {
+  if (!context_wrapper_->browser_context_) {
     // Shutdown has started.
     BrowserThread::PostTask(
         BrowserThread::IO,
@@ -107,8 +100,8 @@
     return;
   }
   // No existing processes available; start a new one.
-  scoped_refptr<SiteInstance> site_instance =
-      SiteInstance::CreateForURL(browser_context_, script_url);
+  scoped_refptr<SiteInstance> site_instance = SiteInstance::CreateForURL(
+      context_wrapper_->browser_context_, script_url);
   RenderProcessHost* rph = site_instance->GetProcess();
   // This Init() call posts a task to the IO thread that adds the RPH's
   // ServiceWorkerDispatcherHost to the