Ensure that the ppp_class_data is freed when a PluginObject isn't created
Ensure that the ppp_class_data is freed when a PluginObject isn't created

PluginObject creation can fail if there isn't a valid V8 context. In this
case we need to take care to free the ppp_class_data.

BUG=594926

Review URL: https://codereview.chromium.org/1805303002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#381605}

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