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IndexedDBContext access is going away, and so these tests need to use
public mojo interfaces instead of private indexeddb interfaces.

This converts some easier browser tests over to using the new interface.

Bug: 1015214
Change-Id: I68bb1cd46ff6ae13d8b113d37886a499e0d97276
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088337Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Auto-Submit: enne <enne@chromium.org>
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747201}