md-history: Fix a search field regression caused by r410495.

The original behavior before r410495 depended on 1px margin-inline-end
specified by the UA stylesheet for -webkit-search-cancel-button. After
r410495, the search field correctly moves the cancel button to the left
side.  This CL recovers the original behavior by adding margin-inline-end
to #searchTerm.

Also, this CL removes selectors for -webkit-search-decoration and
-webkit-search-results-button from cr_toolbar_search_field.html. These
pseudo elements were removed from Blink.

This CL doesn't intend to fix other existing issues.
- We should secure space for the custom clear button at the right side, or
- We should flip the position of the custom clear button; crbug.com/638484

BUG=639256

Change-Id: I9e3368c03067f42235ce4904c47133e4e709a34c
Reviewed-on: https://chromium-review.googlesource.com/c/1491880
Commit-Queue: Kent Tamura <tkent@chromium.org>
Auto-Submit: Kent Tamura <tkent@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636720}
1 file changed