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This reverts commit b4edab24.

Reason for revert: 

Webkit tests on Android nx4 are failing since:
https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Android%20%28Nexus4%29/82322

speculative revert (sorry) since this is the only CL in the blame list realted to text encoding and the error says:

"
UnicodeDecodeError raised: 'ascii' codec can't decode byte 0xe2 in position 146896: ordinal not in range(128)
...
"

Original change's description:
> Add UnencodableHandling::kNoUnencodables
> 
> The are no unencodable characters in UTF-8, however previously callers
> to blink::TextCoder::Encode had to pass a dummy UnencodableHandling
> argument. Add a kNoUnencodables value to the UnencodableHandling which is
> an explicit no-op. Also add DCHECKs that is is only used for UTF-8 or
> UTF-16.
> 
> Convert callers to use kNoUnencodables where the encoding is statically
> known to be UTF-8.
> 
> It's still valid to use other values for the UnencodableHandling
> argument with UTF-8 or UTF-16; kNoUnencodables simply documents that it
> makes no difference.
> 
> Change-Id: I5eebe4c76ae4006ee91f3884f94ec3b5e410685b
> Reviewed-on: https://chromium-review.googlesource.com/1206055
> Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Joshua Bell <jsbell@chromium.org>
> Commit-Queue: Adam Rice <ricea@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#589451}

TBR=jsbell@chromium.org,ricea@chromium.org,yhirano@chromium.org,haraken@chromium.org

Change-Id: Iaddd13dc7e2fe9473528710dcdaf080f50d01ecc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1213085Reviewed-by: Markus Heintz <markusheintz@chromium.org>
Commit-Queue: Markus Heintz <markusheintz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589501}