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Resolve error opening files whose name contain blacklisted characters
for URL spoofing, such as "🔒" (U+1F512).

This change also removes the tentative hack at crrev.com/c/1085207 for
crbug.com/847039.


Bug: 847039,849998
Test: unit_tests --gtest_filter=ExternalFileURLUtilTest.*:FileManagerPath.*
Test: net_unittests --gtest_filter=EscapeTest.*
Change-Id: Icd8ba4c73f09b97e05c9af182d338e709d5876f6
Reviewed-on: https://chromium-review.googlesource.com/1142854
Commit-Queue: Asanka Herath <asanka@chromium.org>
Reviewed-by: Asanka Herath <asanka@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579543}