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This CL adds ClearIndex function to the mojom interface IndexProxy.

Bug: 1132170
Change-Id: Iaa1a3c2846bcc8c94bd758fa784e736b953e3a63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437835Reviewed-by: Jia Meng <jiameng@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Thanh Nguyen <thanhdng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812514}