Translate: Bug fix: need to normalize the language code for Translate UI

Translate: Bug fix: need to normalize the language code for Translate UI

Take over this CL from hajimehoshi@chromium.org, and just rebase the CL
to trunk.

Original description by hajimehoshi@ follows;

Before passing the language code to Translate UI, this must be
normalized (like 'hi-IN' -> 'hi').

I mistakenly droped this process when moving GetTranslateLanguages from
translate_bubble_view.cc to translate_tab_helper.cc
(https://codereview.chromium.org/203223002) :-(

BUG=380137
R=toyoshim@chromium.org
TBR=hajimehoshi@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=275786

[Takashi Toyoshima, 2014-06-09 05:23:18]

https://codereview.chromium.org/322733002/diff/1/chrome/browser/translate/chr...
File chrome/browser/translate/chrome_translate_client.cc (right):

https://codereview.chromium.org/322733002/diff/1/chrome/browser/translate/chr...
chrome/browser/translate/chrome_translate_client.cc:129: *source =
TranslateDownloadManager::GetLanguageCode(
take over from https://codereview.chromium.org/317623003

[Takashi Toyoshima, 2014-06-09 05:23:39]

The CQ bit was checked by toyoshim@chromium.org

[commit-bot: I haz the power, 2014-06-09 05:24:14]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/toyoshim@chromium.org/322733002/1

[commit-bot: I haz the power, 2014-06-09 05:24:15]

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

[commit-bot: I haz the power, 2014-06-09 05:24:15]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Takashi Toyoshima, 2014-06-09 05:24:41]

The CQ bit was checked by toyoshim@chromium.org

[commit-bot: I haz the power, 2014-06-09 05:24:43]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/toyoshim@chromium.org/322733002/1

[commit-bot: I haz the power, 2014-06-09 07:56:43]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_clang_dbg/bui...)

[commit-bot: I haz the power, 2014-06-09 11:11:57]

Change committed as 275786

[hajimehoshi, 2014-06-10 22:35:57]

Thank you, but is this meagiable to M36?