Change error status code for out of quota to be 403 instead of 413

Instead of returning 413 as the error status code when the
request fails due to lack of quota we should return 403

DocImpact: Return 403 Forbidden instead of 413 RequestEntityTooLarge
when a request fails due to lack of quota

Change-Id: I7c179748769b8a0e2cc2e476ebefe33449f6f304
Closes-Bug: 1298131
Merge "Change error status code for out of quota to be 403 instead of 413"