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This CL modifies the LeakDetector to force immediate crash when an
optional commandline argument is specified to content_shell.

Usage:
$ content_shell --dump-render-tree --enable-leak-detection=crash-on-failure

This enables us to use the ClusterFuzz infrastructure to investigate and
minimize leaks, as the tool currently detects the test case pass/fail by
seeing if the process crashes.

BUG=None

Review URL: https://codereview.chromium.org/405433011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284064 0039d316-1c4b-4281-b951-d872f2087c98