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While implementing file drag and drop, I have discovered that
net::FilePathToFileURL does not correctly handle paths which end with a
space char.

GURL does some modifications to the path in its constructor so we must
percent-encode control chars before calling it to avoid corruption.

Bug: 1144138
Change-Id: Ie8e601edbc42033e33389ff4bd48046d16571ab8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522735
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825587}