* DumpRenderTree/DumpRenderTree.m: Instead of allocating a single local

    * DumpRenderTree/DumpRenderTree.m: Instead of allocating a single local
        pasteboard, allocate any number of local pasteboards.
        (main): Allocate the dictionary of pasteboards.
        (+[DumpRenderTreePasteboard _pasteboardWithName:]): Allocate a pasteboard,
        given a name.
        (+[LocalPasteboard alloc]): Added, so we don't have to call NSAllocateObject
        explicitly elsewhere.
        (-[LocalPasteboard addTypes:owner:]): Added a check that the owner responds
        to the selector rather than calling unconditionally.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@17480 268f45cc-cd09-0410-ab3c-d52691b4dbfc