Quota code cleanup

* Replace foo_usage_tracker_ with GetUsageTracker(type) in quota_manager.cc
* Killing unused template types in quota_types.h
* Adding parameter names in Callback typedefs in quota_types.h

BUG=none
TEST=green bots


Review URL: https://chromiumcodereview.appspot.com/10882009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@153182 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed