Annotate TimerBase::CancellableTimerTask destructor as ASan ignorable.
Annotate TimerBase::CancellableTimerTask destructor as ASan ignorable.

Just like its run() method, the destructor may touch its Timer owner when
it is in a to-be-swept state; allow it.

R=haraken
BUG=581448

Review URL: https://codereview.chromium.org/1666133002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#373534}

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