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ActiveScriptWrappable is designed to be inherited.  The ctor should
be protected:.

Also all classes that support virtual member functions should have
the virtual dtor.

Change-Id: I1eaa60b45607b5404868e0d293a150e1b98dfc5b
Reviewed-on: https://chromium-review.googlesource.com/964068Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543343}