Fixed: <rdar://problem/4147745> JavaScript discards locally defined "arguments"...
drwxr-xr-x - JavaScriptCore
drwxr-xr-x - LayoutTests
drwxr-xr-x - WebCore
drwxr-xr-x - WebKit
drwxr-xr-x - WebKitLibraries
drwxr-xr-x - WebKitTools