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Renames https_invalid.icon since the triangle icon will be used
for HTTP pages as well as part of crbug.com/997972.

Bug: 1008218
Change-Id: I031ab884361c5085f7ef0f7b93935e235540005a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846567Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705185}