There is still some Mountain Lion related settings in ANGLE's Base.xcconfig, and it is causing problems when trying to build with ASan enabled. We should remove it.
rdar://problem/23566856
Created attachment 266292 [details] Patch Patch removes TOOLCHAIN settings from the Base.xcconfig file. The only reason these existed was for Mountain Lion support.
Note that there are important steps to take when updating ANGLE. See http://trac.webkit.org/wiki/UpdatingANGLE
Committed r192840.