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Previously the frame to be deleted was search in |frames_| twice, which
is not necessary.

Change-Id: Ieb0df172ef6c04249d2c44588a932d28f5158908
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1986190
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728047}