Back out bug 916257 on a CLOSED TREE (DONTBUILD)
Bug 897504 - Implement region API for Gecko. r=giles, khuey
Bug 666816 - Implement the new e10s message passing code for the findbar. r=felipe
Bug 910436 - Electrolysis: Pass PBrowser to the PExternalHelperAppParent so that we can get a window for the download box. r=jdm