Added and replaced some UMAs.
1) Deprecated the UMA key "Translate.ServerReportedUnsupportedLanguage" (the internal histograms.xml should be modified later).
2) Added the UMA key "Translate.UnavailableLanguage" which is sent when the language is reported by the server but not available for the user locale.
[We decided to implement a new UMA instead of 2) in another CL]
3) Added the UMA key "Translate.UnsupportedLanguageAtInitiation" which is sent when the language was unsupported during initialization.
BUG=
242142
TEST=unit_tests
Committed:
https://src.chromium.org/viewvc/chrome?view=rev&revision=202836