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The CrashDumpManagerAndroid instance must be initialized before any
child process is created. This change moves the initialization to
PreThreadsCreate, which at the very least should be before the
PROCESS_LAUNCHER thread (where the potentially evil child processes will
be created). #nocrashes

BUG=439322

Review URL: https://codereview.chromium.org/889083002

Cr-Commit-Position: refs/heads/master@{#314083}