Revert the merge. Mac build is mysteriously broken.

third_party/WebKit/JavaScriptCore/JavaScriptCore.scons

 # The keys in sources are the paths to the directories
 # the values are an array of source files in those directories to compile
 sources = {}
 sources['API'] = [
     'API/JSBase.cpp',
     'API/JSCallbackConstructor.cpp',
     'API/JSCallbackFunction.cpp',
     'API/JSCallbackObject.cpp',
     'API/JSClassRef.cpp',
     'API/JSContextRef.cpp',
@@ skipping 131 matching lines @@
 ]
 sources['wtf'] = [
     'wtf/Assertions.cpp',
     'wtf/ByteArray.cpp',
     'wtf/CurrentTime.cpp',
     'wtf/FastMalloc.cpp',
     'wtf/HashTable.cpp',
     'wtf/RandomNumber.cpp',
     'wtf/RefCountedLeakCounter.cpp',
     'wtf/Threading.cpp',
-    'wtf/TypeTraits.cpp',
     'wtf/dtoa.cpp',
 ]
 sources['wtf/unicode'] = [
     'wtf/unicode/CollatorDefault.cpp',
     'wtf/unicode/UTF8.cpp',
 ]
 sources['wtf/unicode/icu'] = [
     'wtf/unicode/icu/CollatorICU.cpp',
 ]
 
@@ skipping 140 matching lines @@
 elif building_on_win32:
     env.Append(CPPPATH = ['os-win32', WebKitLibraries('include')])
     env.Prepend(LIBPATH = [WebKitLibraries('lib')])
     env.Append(LIBS = ['icuin', 'icuuc', 'user32', 'winmm'])
 
 env.Program('jsc', shell_sources)