[bindings] Assert toDoubleSlow on v8::Value being a number.
[bindings] Assert toDoubleSlow on v8::Value being a number.

R=jl@opera.com, haraken@chromium.org

Review URL: https://codereview.chromium.org/946293003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@190651 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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