Remove unnecessary h5 selectors

They were only here for backwards-compatibility due to HTML caching
(see bug 42452).

Change-Id: If1c65d5df8434f06607da99d2380e7b53dfb02e5
Use background-image: none instead of background: none

IE apparently gets confused otherwise.

Bug: 50516
Change-Id: I8560e8d0033906a75fe46bbb389583c0e6969f7a
Merge changes I8560e8d0,If1c65d5d

* changes:
  Use background-image: none instead of background: none
  Remove unnecessary h5 selectors