Added null check to signal handler TearDown method This CL adds a null check to the TearDown method of SignalHandler to try to fix a ChromeOS crash. Bug: 1449437 Change-Id: I3e22b6c4ded285e0b20f60f00b8b49967742daea Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4577558 Commit-Queue: Salvador Guerrero Ramos <salg@google.com> Reviewed-by: Min Qin <qinmin@chromium.org> Cr-Commit-Position: refs/heads/main@{#1152811}
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