Retrieve per host storage usage from QuotaManager.

R=kinuko@chromium.org
BUG=none
TEST=QuotaManagerTest.GetUsage

Review URL: http://codereview.chromium.org/8079004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@103921 0039d316-1c4b-4281-b951-d872f2087c98
void UsageTracker::UpdateUsageCache(
    QuotaClient::ID client_id, const GURL& origin, int64 delta) {
  ClientUsageTracker* client_tracker = GetClientTracker(client_id);
  DCHECK(client_tracker);
   client_tracker->UpdateUsageCache(origin, delta);
 }

void UsageTracker::UpdateUsageCache(
    QuotaClient::ID client_id, const GURL& origin, int64 delta) {
  ClientUsageTracker* client_tracker = GetClientTracker(client_id);
  DCHECK(client_tracker);
   client_tracker->UpdateUsageCache(origin, delta);
 }
