TracingHook: Simplify parsing of trace option
TracingHook: Simplify parsing of trace option

We don't need to create a map just to parse the trace option.

Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>
Change-Id: I55b4839111d22f30b5c28fd24a6e1869a7892a4b

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