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This CL adds GetAlwaysTranslateLanguages to TranslateBridge.java and
translate_prefs.cc. This will be used by the new language settings page
on Android.  Some basic tests are added for AlwaysTranslateLanguage
related code in translate_prefs.cc.

TranslateBridge.java is also cleaned up a little.  The biggest cleanup
is that the unused function isBlockedLanguage2 is removed from both
ends of the bridge.


Bug: 1127531
Change-Id: Ia533492b92b7d298f54afcca5b82be033eb6ad71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626910Reviewed-by: Megan Jablonski <megjablon@chromium.org>
Reviewed-by: Max Curran <curranmax@chromium.org>
Commit-Queue: Trevor  Perrier <perrier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843348}