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Extracted from https://chromiumcodereview.appspot.com/23240002/

Currently we create all usage trackers for each pair QuotaClient/StorageType.
Most clients only support one storage type and filesystem support variable
list of types (it doesn't have kStorageTypeSyncable in unittests).

If filesystem has no syncable storage backend it not useless to keep create ClientUsageTracker. This tracker fails when GetHostUsage is invoked. So let's don't create it.

BUG=281252

Review URL: https://chromiumcodereview.appspot.com/23545016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221244 0039d316-1c4b-4281-b951-d872f2087c98