[Sync] Rename syncable_prefs to sync_preferences.

chrome/test/base/testing_profile_manager.h

Index: chrome/test/base/testing_profile_manager.h
diff --git a/chrome/test/base/testing_profile_manager.h b/chrome/test/base/testing_profile_manager.h
index 3c0c5d0e2260e9f7fb7969e2cd3994d3e4fe2b54..6d9e896f0fa22de22c772c1107c04f56b6f95251 100644
--- a/chrome/test/base/testing_profile_manager.h
+++ b/chrome/test/base/testing_profile_manager.h
@@ -22,7 +22,7 @@ class ProfileAttributesStorage;
 class ProfileManager;
 class TestingBrowserProcess;
 
-namespace syncable_prefs {
+namespace sync_preferences {
 class PrefServiceSyncable;
 }
 
@@ -55,7 +55,7 @@ class TestingProfileManager {
   // |factories| contains BCKSs to use with the newly created profile.
   TestingProfile* CreateTestingProfile(
       const std::string& profile_name,
-      std::unique_ptr<syncable_prefs::PrefServiceSyncable> prefs,
+      std::unique_ptr<sync_preferences::PrefServiceSyncable> prefs,
       const base::string16& user_name,
       int avatar_id,
       const std::string& supervised_user_id,