Keep track of ServiceWorkerContext's BrowserContext and expose it.

content/browser/service_worker/service_worker_context_wrapper.cc

 // Copyright 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 "content/browser/service_worker/service_worker_context_wrapper.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 55 matching lines @@
   if (!handler || !handler->context())
     return nullptr;
   return handler->context()->wrapper_;
 }
 
 ServiceWorkerContextWrapper::ServiceWorkerContextWrapper(
     BrowserContext* browser_context)
     : observer_list_(
           new ObserverListThreadSafe<ServiceWorkerContextObserver>()),
       process_manager_(new ServiceWorkerProcessManager(browser_context)),
-      is_incognito_(false) {
+      is_incognito_(false),
+      browser_context_(browser_context) {
 }
 
 ServiceWorkerContextWrapper::~ServiceWorkerContextWrapper() {
 }
 
 void ServiceWorkerContextWrapper::Init(
     const base::FilePath& user_data_directory,
     storage::QuotaManagerProxy* quota_manager_proxy,
     storage::SpecialStoragePolicy* special_storage_policy) {
   is_incognito_ = user_data_directory.empty();
@@ skipping 272 matching lines @@
     context_core_.reset();
     return;
   }
   context_core_.reset(new ServiceWorkerContextCore(context_core_.get(), this));
   DVLOG(1) << "Restarted ServiceWorkerContextCore successfully.";
 
   observer_list_->Notify(&ServiceWorkerContextObserver::OnStorageWiped);
 }
 
 }  // namespace content