Bug 1017115 - Fixes rule-view's highlight race condition to avoid duplicate headers; r=bgrins

--HG--
rename : browser/devtools/styleinspector/test/browser_ruleview_content.js => browser/devtools/styleinspector/test/browser_ruleview_content_01.js
Merge mozilla-central and fx-team
Bug 1018468 - Provide a fullscreen button in videos. r=mfinkle
Bug 817716 - Add 3-dot menu to tabs panel, including a "close all tabs" option. r=bnicholson
Backed out changeset e9a025ac70fe for tablet fail on a CLOSED TREE
backout 25fb66c1006f for test failure on a CLOSED TREE
Merge fx-team to m-c a=merge