Patch coming.
Created attachment 233002 [details] the patch.
Thanks for the review. Landed in r169920: <http://trac.webkit.org/r169920>.
FYI, the efl-wk2 bot failure is due to a tool chain issue and is unrelated to this patch: [ 17%] Building CXX object Source/WebCore/CMakeFiles/WebCore.dir/__/__/DerivedSources/WebCore/JSAudioStreamTrack.cpp.o c++: internal compiler error: Killed (program cc1plus) Please submit a full bug report, with preprocessed source if appropriate. See <file:///usr/share/doc/gcc-4.8/README.Bugs> for instructions. make[2]: *** [Source/WebCore/CMakeFiles/WebCore.dir/dom/Document.cpp.o] Error 4 make[2]: *** Waiting for unfinished jobs.... make[1]: *** [Source/WebCore/CMakeFiles/WebCore.dir/all] Error 2 make: *** [all] Error 2