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Fix three Tab UI bugs:
1. The always translate checkbox in the menu was retranslating an
already translated page when toggled.

2. When reverting a translation from the tab UI, the model's view state
was not being updated. This meant if a user untranslated the page after
clicking the always translate button in the menu, then clicked always
translate again, the page wouldn't translate since the model's state is
incorrectly "translated" rather than "before translate".

3. The 'always translate' button beneath the tab UI was not being
updated when the always translate menu item was being clicked.

Additionally this CL removes some unused code that was missed in the
experiment cleanup.

Bug: 1099571
Change-Id: I0b3545463acc257ab69cd616bce2e9e833cf2ac4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2269751Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Commit-Queue: Megan Jablonski <megjablon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785801}