Stop sending/saving cookies for translate server requests.
Stop sending/saving cookies for translate server requests.

Add hl=<UI Language> query param instead.

BUG=118960
TEST=browsertest --gtest_filter=TranslateManagerTest.*


Review URL: http://codereview.chromium.org/9791078

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@129577 0039d316-1c4b-4281-b951-d872f2087c98

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