Bug 841847: Ensure that we reflow a flex container's children, if any of them received a "measuring" reflow. r=dbaron a=lsblakk

--HG--
rename : layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-1-iframe.html => layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-2-iframe.html
rename : layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-1-ref.xhtml => layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-2-ref.xhtml
rename : layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-1.xhtml => layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-2.xhtml
rename : layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-1-iframe.html => layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-3-iframe.html
rename : layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-1-ref.xhtml => layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-3-ref.xhtml
rename : layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-1.xhtml => layout/reftests/flexbox/flexbox-dyn-changeFrameWidth-3.xhtml
Bug 843638: Uplift Add-on SDK stabilization branch. a=bajaj

https://github.com/mozilla/addon-sdk/compare/4e44dd094e8636216e8c9ca5664866a5cf7d0cdd...b563e7dd1c882eccfacdec1171758e03f6e044f5