Convert non-WHATWG text encoding to ASCII

Convert non-WHATWG text encoding to ASCII

CED is returning text encodings not supported by WHATWG
standard, which Blink refused to accept. It can cause
an unexpected bug. This CL converts those encoding to ASCII
so that raw bytes of the text remain intact.

BUG=698605
NOTRY=true
NOPRESUBMIT=true
TBR=tkent@chromium.org

Review-Url: https://codereview.chromium.org/2737033003
Cr-Commit-Position: refs/heads/master@{#455560}
(cherry picked from commit a86006db0adbe5bda6789d2a14d0805ce6273596)

Review-Url: https://codereview.chromium.org/2742873002 .
Cr-Commit-Position: refs/branch-heads/3029@{#97}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/4c33f0d70750323bef4101380076570d1f2e803c

[Jinsuk Kim, 2017-03-09 23:26:17]

Description was changed from

==========
Convert non-WHATWG text encoding to ASCII

CED is returning text encodings not supported by WHATWG
standard, which Blink refused to accept. It can cause
an unexpected bug. This CL converts those encoding to ASCII
so that raw bytes of the text remain intact.

BUG=698605
NOTRY=true
NOPRESUBMIT=true
TBR=tkent@chromium.org

Review-Url: https://codereview.chromium.org/2737033003
Cr-Commit-Position: refs/heads/master@{#455560}
(cherry picked from commit a86006db0adbe5bda6789d2a14d0805ce6273596)
==========

to

==========
Convert non-WHATWG text encoding to ASCII

CED is returning text encodings not supported by WHATWG
standard, which Blink refused to accept. It can cause
an unexpected bug. This CL converts those encoding to ASCII
so that raw bytes of the text remain intact.

BUG=698605
NOTRY=true
NOPRESUBMIT=true
TBR=tkent@chromium.org

Review-Url: https://codereview.chromium.org/2737033003
Cr-Commit-Position: refs/heads/master@{#455560}
(cherry picked from commit a86006db0adbe5bda6789d2a14d0805ce6273596)

Review-Url: https://codereview.chromium.org/2742873002 .
Cr-Commit-Position: refs/branch-heads/3029@{#97}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/4c33f0d70750323bef4101380076...
==========

[Jinsuk Kim, 2017-03-09 23:26:19]

Committed patchset #1 (id:1) manually as
4c33f0d70750323bef4101380076570d1f2e803c.

[tkent, 2017-03-10 00:23:59]

lgtm