Instead of dumping resources to a context, we use the release APIs
consistently. Refactoring/cleanup change only. Should have very litte
impact on runtime behaviour.

Bug: angleproject:2464
Change-Id: I2dc7f8316c466f7ccfad50a7b792ba0ee7bc2e49
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1804883Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>