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This function is used only in local_frame.cc past [1]. This CL
moves it out of the Blink API, down to the aforemented file.

[1] https://crrev.com/c/2028708

BUG=919392, 1041083
R=haraken@chromium.org

Change-Id: I5f3a5167751f3e37142967d584ec4cf7c824af39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2056460
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743080}