Remove win7_aura in PRESUBMIT.py.

This was inadvertently added in https://chromiumcodereview.appspot.com/116673003/ when the win7_aura builder had already been removed.

BUG=278554
TBR=maruel@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/118963002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241805 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241805
Stop hiding the dropdown triangle of file-type selector on hover.

Previously the border image of the element for hover state is specified as
'fill', which hides the dropbown triangle. This CL overrides CSS and remove the
fill specifying.

BUG=328882
TEST=Prepare input tag with accept attribute and click it. Check the file filter
    selector.

Review URL: https://codereview.chromium.org/108023004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241806 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241806