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2bd75529 - cleanup chromium event log on dynamo exit rather than on entry (#143175)

cleanup chromium event log on dynamo exit rather than on entry (#143175) Summary: clearing at dynamo start is an issue because it throws away events from compiled autograd X-link: https://github.com/pytorch/pytorch/pull/143175 Approved by: https://github.com/Skylion007, https://github.com/jamesjwu ghstack dependencies: #141907 Reviewed By: huydhn Differential Revision: D67551020 Pulled By: xmfan fbshipit-source-id: b92b48e39adc81433934b07ca13e330479233836