Moved JsonPrefStore to use SequencedWorkerPool

chrome/browser/extensions/extension_prefs_unittest.cc

Index: chrome/browser/extensions/extension_prefs_unittest.cc
diff --git a/chrome/browser/extensions/extension_prefs_unittest.cc b/chrome/browser/extensions/extension_prefs_unittest.cc
index d01cb41fa1348fab5c5870ea5dd18fb13a5293d9..882c4f8378c715f266b7e6fbe8ce2fbf327e1ec7 100644
--- a/chrome/browser/extensions/extension_prefs_unittest.cc
+++ b/chrome/browser/extensions/extension_prefs_unittest.cc
@@ -53,10 +53,11 @@ static void AddPattern(URLPatternSet* extent, const std::string& pattern) {
 
 ExtensionPrefsTest::ExtensionPrefsTest()
     : ui_thread_(BrowserThread::UI, &message_loop_),
-      file_thread_(BrowserThread::FILE, &message_loop_) {
+      prefs_(message_loop_.message_loop_proxy()) {
 }
 
-ExtensionPrefsTest::~ExtensionPrefsTest() {}
+ExtensionPrefsTest::~ExtensionPrefsTest() {
+}
 
 void ExtensionPrefsTest::RegisterPreferences() {}
 
@@ -72,6 +73,8 @@ void ExtensionPrefsTest::TearDown() {
   prefs_.RecreateExtensionPrefs();
   RegisterPreferences();
   Verify();
+  prefs_.pref_service()->CommitPendingWrite();
+  message_loop_.RunUntilIdle();
 }
 
 // Tests the LastPingDay/SetLastPingDay functions.