Moved JsonPrefStore to use SequencedWorkerPool

chrome/browser/policy/managed_mode_policy_provider.cc

Index: chrome/browser/policy/managed_mode_policy_provider.cc
diff --git a/chrome/browser/policy/managed_mode_policy_provider.cc b/chrome/browser/policy/managed_mode_policy_provider.cc
index 7fecdb183a849db3656846f481c5f1c8a485e708..cbd64c4bc9ef64c424de611442570279198ee9b8 100644
--- a/chrome/browser/policy/managed_mode_policy_provider.cc
+++ b/chrome/browser/policy/managed_mode_policy_provider.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/policy/managed_mode_policy_provider.h"
 
 #include "base/prefs/json_pref_store.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/policy/policy_bundle.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_constants.h"
@@ -18,12 +19,11 @@ namespace policy {
 const char ManagedModePolicyProvider::kPolicies[] = "policies";
 
 // static
-ManagedModePolicyProvider* ManagedModePolicyProvider::Create(Profile* profile) {
-  JsonPrefStore* pref_store =
-      new JsonPrefStore(profile->GetPath().Append(
-                            chrome::kManagedModePolicyFilename),
-                        BrowserThread::GetMessageLoopProxyForThread(
-                            BrowserThread::FILE));
+ManagedModePolicyProvider* ManagedModePolicyProvider::Create(
+    Profile* profile,
+    base::SequencedTaskRunner* sequenced_task_runner) {
+  FilePath path = profile->GetPath().Append(chrome::kManagedModePolicyFilename);
+  JsonPrefStore* pref_store = new JsonPrefStore(path, sequenced_task_runner);
   return new ManagedModePolicyProvider(pref_store);
 }