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This CL removes the out-of-process browser hang instrumentation used to
capture 20s hangs and failed rendezvous crash reports in one-off canary
releases. The Kasko reporter is deprecated, and CrashPad does not yet
support the use case.

The plan is to restore this functionality once CrashPad supports it.

BUG=622314

Review-Url: https://codereview.chromium.org/2086403002
Cr-Commit-Position: refs/heads/master@{#402189}