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and its implementation. This was abandoned in favor of
CaptureThumbnailBeforeNavigatingAway.

Bug: 765588
Change-Id: I1a587f809d6d25d446157731601c0a03d625dc69
Reviewed-on: https://chromium-review.googlesource.com/672525Reviewed-by: Friedrich Horschig <fhorschig@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#503503}