Quota: Remove unused #include in //storage/browser/quota/quota_callbacks.h.

Bug: 1016065
Change-Id: Ibfdf962f7cba595e47d557556369b3868d9b69e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627430
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843225}

storage/browser/quota/quota_callbacks.h

@@ -16,7 +16,6 @@
 #include "base/callback.h"
 #include "base/containers/contains.h"
 #include "base/optional.h"
-#include "storage/browser/quota/quota_client.h"
 #include "third_party/blink/public/mojom/quota/quota_types.mojom-forward.h"
 
 namespace url {