Bug 887703 - navigator.doNotTrack returns { "0", "1", "unspecified" }. r=jlebar

--HG--
rename : dom/tests/mochitest/general/test_bug629535.html => dom/tests/mochitest/general/test_donottrack.html
Bug 905240 - Make HTMLInputElement.{width,height} getter return 0 for type!='image'. r=Ms2ger
bug 905161 - Cache OpenGL features in GLContext - r=jgilbert
bug 905161 - Remove the return type of GLContext::MarkUnsupported - r=jgilbert