Bug 996742 - Remove unused forward declare in the wrong namespace. r=nrc
Bug 996677 - Incorrect call DeviceRotationRate() ctor from another one. r=VYV03354
Bug 971153 - Write a test for bug 751465. r=mcmanus

This patch adds a) a test for the fixed proxy bypass in bug 751465 and
makes b) some underlying changes to the nsDNSService to be able to write
that test in the first place.
Bug 994856 - Add support for Gecko rendering via GLScreenBuffer into external GL Context. r=bjacob,jgilbert
Bug 996738 - Change #define to const int to work better with unified builds. r=mattwoodrow