Oilpan: Attempt to fix windows build after r191735
Oilpan: Attempt to fix windows build after r191735

r191735 caused the following compile error in msvc. This CL attempts to fix the issue by disambiguating it:
e:\b\build\slave\webkit_win_oilpan__dbg_\build\src\third_party\webkit\source\bindings\core\v8\v8perisolatedata.cpp(272) : error C2666: 'blink::Persistent<T,blink::GlobalPersistents>::operator =' : 2 overloads have similar conversions
        with
        [
            T=blink::ScriptDebugServer
        ]
        e:\b\build\slave\webkit_win_oilpan__dbg_\build\src\third_party\webkit\source\platform\heap\handle.h(317): could be 'blink::Persistent<T,blink::GlobalPersistents> &blink::Persistent<T,blink::GlobalPersistents>::operator =(std::nullptr_t)'
        with
        [
            T=blink::ScriptDebugServer
        ]
        e:\b\build\slave\webkit_win_oilpan__dbg_\build\src\third_party\webkit\source\platform\heap\handle.h(355): or       'blink::Persistent<T,blink::GlobalPersistents> &blink::Persistent<T,blink::GlobalPersistents>::operator =(const blink::Persistent<T,blink::GlobalPersistents> &)'
        with
        [
            T=blink::ScriptDebugServer
        ]
        e:\b\build\slave\webkit_win_oilpan__dbg_\build\src\third_party\webkit\source\platform\heap\handle.h(379): or       'blink::Persistent<T,blink::GlobalPersistents> &blink::Persistent<T,blink::GlobalPersistents>::operator =<blink::ScriptDebugServer>(const WTF::RawPtr<T> &)'
        with
        [
            T=blink::ScriptDebugServer
        ]
        while trying to match the argument list '(blink::CrossThreadPersistent<blink::ScriptDebugServer>, WTF::RawPtr<blink::ScriptDebugServer>)'

BUG=462572
R=tkent@chromium.org

Review URL: https://codereview.chromium.org/999973002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191744 bbb929c8-8fbe-4397-9dbb-9b2b20218538

XiaosongWei/blink-crosswalk,smishenk/blink-crosswalk,XiaosongWei/blink-crosswalk,Pluto-tv/blink-crosswalk,PeterWangIntel/blink-crosswalk,Pluto-tv/blink-crosswalk,smishenk/blink-crosswalk,PeterWangIntel/blink-crosswalk,Pluto-tv/blink-crosswalk,XiaosongWei/blink-crosswalk,Pluto-tv/blink-crosswalk,XiaosongWei/blink-crosswalk,Bysmyyr/blink-crosswalk,smishenk/blink-crosswalk,PeterWangIntel/blink-crosswalk,kurli/blink-crosswalk,Bysmyyr/blink-crosswalk,Bysmyyr/blink-crosswalk,XiaosongWei/blink-crosswalk,smishenk/blink-crosswalk,Bysmyyr/blink-crosswalk,PeterWangIntel/blink-crosswalk,kurli/blink-crosswalk,Pluto-tv/blink-crosswalk,Bysmyyr/blink-crosswalk,PeterWangIntel/blink-crosswalk,Pluto-tv/blink-crosswalk,kurli/blink-crosswalk,XiaosongWei/blink-crosswalk,smishenk/blink-crosswalk,kurli/blink-crosswalk,kurli/blink-crosswalk,PeterWangIntel/blink-crosswalk,Bysmyyr/blink-crosswalk,Pluto-tv/blink-crosswalk,kurli/blink-crosswalk,smishenk/blink-crosswalk,Bysmyyr/blink-crosswalk,Bysmyyr/blink-crosswalk,kurli/blink-crosswalk,kurli/blink-crosswalk,Bysmyyr/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,XiaosongWei/blink-crosswalk,Bysmyyr/blink-crosswalk,XiaosongWei/blink-crosswalk,PeterWangIntel/blink-crosswalk,PeterWangIntel/blink-crosswalk,PeterWangIntel/blink-crosswalk,PeterWangIntel/blink-crosswalk,smishenk/blink-crosswalk,XiaosongWei/blink-crosswalk,smishenk/blink-crosswalk,kurli/blink-crosswalk,XiaosongWei/blink-crosswalk,smishenk/blink-crosswalk,kurli/blink-crosswalk,smishenk/blink-crosswalk,Pluto-tv/blink-crosswalk