Moved JsonPrefStore to use SequencedWorkerPool

chrome/browser/extensions/extension_prefs_unittest.h

Index: chrome/browser/extensions/extension_prefs_unittest.h
diff --git a/chrome/browser/extensions/extension_prefs_unittest.h b/chrome/browser/extensions/extension_prefs_unittest.h
index ba5832a009b2734c69355e580a0624e13f789d05..9b1277fd198e32d963b3ec593d2d06e913d8f305 100644
--- a/chrome/browser/extensions/extension_prefs_unittest.h
+++ b/chrome/browser/extensions/extension_prefs_unittest.h
@@ -11,6 +11,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
+class SequencedWorkerPool;
 class Value;
 }
 
@@ -40,13 +41,15 @@ class ExtensionPrefsTest : public testing::Test {
   virtual void TearDown() OVERRIDE;
 
  protected:
-  ExtensionPrefs* prefs() { return prefs_.prefs(); }
+  ExtensionPrefs* prefs() { return prefs_->prefs(); }
 
   MessageLoop message_loop_;
   content::TestBrowserThread ui_thread_;
   content::TestBrowserThread file_thread_;
 
-  TestExtensionPrefs prefs_;
+  scoped_ptr<TestExtensionPrefs> prefs_;
+  // A blocking pool that we can use for file operations.
+  scoped_refptr<base::SequencedWorkerPool> blocking_pool_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrefsTest);