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Currently Blink is shut down before all the pending tasks in the message loop are deleted. This is problematic in Oilpan because a destructor of the pending tasks can touch Oilpan objects. Because Oilpan is already detached from the renderer thread at that point, touching Oilpan objects in the destructor leads to a crash. (See the bug report for a concrete scenario.)

To prevent Blink objects from getting accessed after Blink is shut down, this CL deletes all pending tasks in a message loop before shutting down Blink.

BUG=411026
TEST=None. I cannot reproduce the crash.

Review URL: https://codereview.chromium.org/583043005

Cr-Commit-Position: refs/heads/master@{#296697}