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tzik authored
This CL is a reraise of http://crrev.com/2785943004 PS4. A null callback posted to PostTask family eventually causes a null pointer access crash. And its crash report doesn't indicate the culprit directly without looking into the local variable of the minidump. After this CL, the crash happens earlier and the crash report will have meaningful trace. BUG=711167, 709149 Review-Url: https://codereview.chromium.org/2815573002 Cr-Commit-Position: refs/heads/master@{#464333}
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