Make sure pending cookie persistence canceled

When a full app is uninstalled we delete its instant app
cookie but were not canceling a pending write which ended
up having the written cookie file after the app is uninstalled.

Test: InstantCookieHostTest#testCookieResetOnNonInstantReinstall

bug:36455310

Change-Id: Iec6d1f95f8ff731885241913808daf12ce3a5587