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This CL fixes a bug in the code that resets to the on-page-load state
for the simplified domain hide-on-interaction field trial.

The bug is that this reset code let the omnibox bounds go unchanged
if the new text was not eligible for simplified domain eliding.
For example, when switching to a new tab (as shown in
https://bugs.chromium.org/p/chromium/issues/detail?id=1112577#c4), the
placeholder text could get cut off because the omnibox was remaining
at the bounds used for the last simplified domain elision. The fix is
to restore the omnibox to its local bounds, with ELIDE_TAIL behavior,
when the text is not eligible for simplified domain eliding.

Bug: 1107912, 1112577
Change-Id: I36c359831fc1f7b18c814d9144b801655bd3b1c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2342123Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795953}