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This CL removes the unused histogram Translate.UndisplayableLanguage.

This histogram records languages that can be translated but are not
displayable in the current UI language. This happens because some
Chrome languages do not have language name translations in their ICU
file (or in java.util for Android).

We don't need a histogram to capture these.  We can find them with a
script.  Also, this histogram doesn't report which UI language the
language name isn't available in which is what we would need to make
fix the problem.

Bug: 1037346
Change-Id: I995611743c5f37d7a6fc0cca67a55f6356738933
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617217
Commit-Queue: Trevor  Perrier <perrier@chromium.org>
Reviewed-by: Megan Jablonski <megjablon@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842759}