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Geolocation::HandleError discards TraceWrapperMembers (notifiers)
in the middle of their use, so wrapper-tracing stops working.
If V8 GC runs while the callbacks are running, as
TraceWrapperMembers are already cleared, the underlying V8 objects
will be gone.

This patch fixes the issue making Geolocation hold
TraceWrapperMembers during the invocation of the callbacks.

Bug: 792604
Change-Id: I6eedc5bc3d82806b1ab0ee2cf2fc3d7a8a018e14
Reviewed-on: https://chromium-review.googlesource.com/824322Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525283}