Story 1512: Update the chrome header

No changes to HTML necessary for now, but this patch should be followed
by a patch changing page header HTML and reusing new overlay header
markup and CSS.

Note: refresh button in Nearby doesn't want to stick to the right
side...

Change-Id: I3998c9d3839714ff7b747c1526daa113a89eca9f
Merge "Story 1512: Update the chrome header"