Bug 938489 - 1/3. Don't include glx.h in GLXLibrary.h - r=mattwoodrow
Bug 938489 - 2/3. Don't include GL headers in glxtest - r=karlt
Bug 938489 - 3/3. Remove configure check for glx.h - r=glandium
Bug 937886 - Build content/canvas/src in unified mode - r=ehsan