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Also adds a presubmit to ensure we don't add new java URI usage.

Change-Id: I4df1b96fd737f19b8d632140d0899377ba8cc63a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2002743
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738750}