-fixed <rdar://problem/4168186> JavaScript fails to throw exceptions
drwxr-xr-x - JavaScriptCore
drwxr-xr-x - LayoutTests
drwxr-xr-x - WebCore
drwxr-xr-x - WebKit
drwxr-xr-x - WebKitLibraries
drwxr-xr-x - WebKitTools