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Images with an explicitly empty alt attribute should be ignored.
Images that do not have the alt attribute explicitly empty will have
automatic image annotation done when possible, so we shouldn't ignore
them.

Bug: 1018853
Change-Id: If8f95d8ed7376797e24707047b5b291bde1555bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881124
Commit-Queue: Jacques Newman <janewman@microsoft.com>
Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Reviewed-by: Kurt Catti-Schmidt <kschmi@microsoft.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713564}