Remove calls to deprecated V8 APIs in V8ValueCache.cpp
Remove calls to deprecated V8 APIs in V8ValueCache.cpp

BUG=324225
R=haraken@chromium.org

Review URL: https://codereview.chromium.org/94893002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@162834 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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