Accessibility: chrome://history keyboarding issues.

Apply aria-haspopup attribute to actions buttons.

BUG=320753
TEST=ctrl+alt+z, tab to actions button and hear "action pop-up button".
R=xiyuan@chromium.org

Review URL: https://codereview.chromium.org/130093003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243929 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243929