[uber page] Fix the missing cancel button on the settings search field.
[uber page] Fix the missing cancel button on the settings search field.

On Mac, the search field's cancel button appeared to be missing. This was caused by applying
a transformX() to header elements to allow them to side-scroll properly. This CL changes to
use margin-left instead. The behavior is the same, but now the cancel button appears properly.
I will be filing a WebKit but since this is probably a core issue with the search control.

BUG=112046
TEST=Verify that search field displays a cancel button when not empty.
Review URL: https://chromiumcodereview.appspot.com/9318009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@119999 0039d316-1c4b-4281-b951-d872f2087c98

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