Remove dedicated TextCodecUTF16

Remove dedicated TextCodecUTF16

Just rely on ICU for UTF-16LE/BE. This fixes some bugs related to
state handling when decoding chunks with an odd number of bytes. It
also removes non-standard special cases for end-of-stream handling.

BUG=468927, 368904

[jsbell, 2015-09-23 17:32:09]

migrated from https://codereview.chromium.org/999953003/

[jsbell, 2016-09-30 18:14:48]

The CQ bit was checked by jsbell@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-30 18:15:43]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-30 19:10:40]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-30 19:10:41]

Dry run: Try jobs failed on following builders:
  android_n5x_swarming_rel on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_n5x_...)

[jsbell, 2016-10-04 21:38:37]

Description was changed from

==========
Remove dedicated TextCodecUTF16

Just rely on ICU for UTF-16LE/BE. This fixes some bugs related to
state handling when decoding chunks with an odd number of bytes. It
also removes non-standard special cases for end-of-stream handling.

BUG=468927, 368904
==========

to

==========
Remove dedicated TextCodecUTF16

Just rely on ICU for UTF-16LE/BE. This fixes some bugs related to
state handling when decoding chunks with an odd number of bytes. It
also removes non-standard special cases for end-of-stream handling.

BUG=468927, 368904
==========