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Addresses a flaky ASAN failure where I believe callbacks from ImpulseCallbackCounter with an unretained reference were being held too long by ProcessManager.

This clears the callbacks immediately when the impulse count is reached, and does not call the quit closure repeatedly.

BUG=332440

Review URL: https://codereview.chromium.org/129243003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244247 0039d316-1c4b-4281-b951-d872f2087c98