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Currently TranslateInforbarView and its subviews assume that the translate
infobar is always created in "before translate" state, i.e., the source
language tab would be selected and the target language tab would be
unselected.

The translate infobar, however, can be created in "translating" or "after
translate" states, i.e., the target language tab would be in loading or
selected states respectively. This CL removes the assumed default state and
instead propagates the default state to the TranslateInforbarView (and its
subviews) after creation.

TBR=droger@

Bug: 910994
Change-Id: Ifdb280a104e61cde81c703a490f7637986b76a72
Reviewed-on: https://chromium-review.googlesource.com/c/1448807
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630049}