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As written, the code would only disable the OS crash reporter if
breakpad was not enabled, which is the opposite of the documented
behavior.

This change results in us calling base::mac::DisableOSCrashDumps() for
all processes where base::mac::IsBackgroundOnlyProcess() is true,
including NaCl processes. Before this change, the OS crash reporter
was triggered when NaCl processes crashed in untrusted code, which
would could take 40+ seconds to complete.

BUG=318501

Review URL: https://codereview.chromium.org/329423003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276928 0039d316-1c4b-4281-b951-d872f2087c98