Remove unnecessary skia dependency in chromium test shell

Now that the infobars are not stubbed anymore it is not needed.

BUG=280695

Review URL: https://codereview.chromium.org/26015003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227113 0039d316-1c4b-4281-b951-d872f2087c98
Separate the painting of the menu marker from painting the rest of the button.

This is useful if subclassed buttons have custom OnPaint code that doesn't call
TextButton::PaintButton() but needs to paint the menu marker as well.

BUG=NONE

Review URL: https://codereview.chromium.org/26025002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227114 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227114