Version 4.4.63.4 (cherry-pick)

Merged 3d5b2f80

Update UTF-8 decoder to detect more special cases.

BUG=chromium:489944
LOG=N
R=hablich@chromium.org
TBR=hablich@chromium.org

Review URL: https://codereview.chromium.org/1157353002

Cr-Commit-Position: refs/branch-heads/4.4@{#8}
Cr-Branched-From: 2e4c5505-refs/heads/4.4.63@{#1}
Cr-Branched-From: 0208b8e3-refs/heads/master@{#28333}