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Instead of using crashpad's crashpad_handler, refactor Android to use
our own custom chrome_crashpad_handler (also used by macOS) and have it
also pass through the CrashpadHandlerMain entry point so that it picks
up any custom crashpad hooks we want to install.

CQ-DEPEND=CL:1707405

Bug: 973167
Change-Id: Id6d91a35ce12e547b4a7c92d07f869c96afae797
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1708838Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682364}