Merge mozilla-central and b2g-inbound

b2g/app/b2g.js

b2g/chrome/content/desktop.js

b2g/chrome/content/shell.html

b2g/chrome/jar.mn

b2g/config/gaia.json

b2g/installer/package-manifest.in

...tools/responsivedesign/test/browser_responsiveui_touch.js

content/base/test/test_XHR_system.html

content/media/encoder/MediaEncoder.cpp

content/media/encoder/MediaEncoder.h

dom/base/Navigator.cpp

dom/base/Navigator.h

dom/base/nsDOMWindowUtils.cpp

dom/base/nsDOMWindowUtils.h

dom/base/test/mochitest.ini

dom/base/test/test_domwindowutils.html

dom/events/nsDOMEvent.h

dom/inputmethod/mochitest/test_basic.html

dom/interfaces/base/nsIDOMWindowUtils.idl

dom/ipc/TabChild.cpp