Moved JsonPrefStore to use SequencedWorkerPool

chrome/browser/sync/credential_cache_service_win.cc

Index: chrome/browser/sync/credential_cache_service_win.cc
diff --git a/chrome/browser/sync/credential_cache_service_win.cc b/chrome/browser/sync/credential_cache_service_win.cc
index 23ac826ef192f9de27889e13a01a48976e48de0f..5889a2444df4c68602c7ecd6bdbfb2fca1c153b0 100644
--- a/chrome/browser/sync/credential_cache_service_win.cc
+++ b/chrome/browser/sync/credential_cache_service_win.cc
@@ -643,8 +643,7 @@ FilePath CredentialCacheService::GetCredentialPathInAlternateProfile() const {
 void CredentialCacheService::InitializeLocalCredentialCacheWriter() {
   local_store_ = new JsonPrefStore(
       GetCredentialPathInCurrentProfile(),
-      content::BrowserThread::GetMessageLoopProxyForThread(
-          content::BrowserThread::FILE));
+      BrowserThread::GetBlockingPool());
   local_store_observer_ = new LocalStoreObserver(this, local_store_);
   local_store_->ReadPrefsAsync(NULL);
 }
@@ -695,8 +694,7 @@ void CredentialCacheService::LookForCachedCredentialsInAlternateProfile() {
   // after initialization is complete.
   alternate_store_ = new JsonPrefStore(
       GetCredentialPathInAlternateProfile(),
-      content::BrowserThread::GetMessageLoopProxyForThread(
-          content::BrowserThread::FILE));
+      BrowserThread::GetBlockingPool());
   alternate_store_observer_ = new AlternateStoreObserver(this,
                                                          alternate_store_);
   alternate_store_->ReadPrefsAsync(NULL);