History: Workaround bug with clear button in search field.

History: Workaround bug with clear button in search field.

Due to a Blink bug (http://crbug.com/231830), the clear button in the
search field is not properly rendered if the <header> element has
its transform style property set to anything other than 'none'.

A simple workaround to make it render properly in 99% of cases is to
set the value of -webkit-transform to 'none' instead of 0px.

BUG=231291
TEST=Open chrome://history, type something in the search field, and
ensure that the clear button (a circle with a "X") is visible.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=194586

[Patrick Dubroy, 2013-04-16 10:55:26]

Evan, please take a look.

[Evan Stade, 2013-04-16 20:09:12]

lgtm

[Patrick Dubroy, 2013-04-17 14:01:51]

Committed patchset #1 manually as r194586 (presubmit successful).