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Simplify BrowserChildProcessHost in preparation for refactoring it so that consumers embed it in their class instead of deriving from it. The GetChildTerminationStatus override in NaclProcessHost seemed unnecessary since that's what the default implementation does. NaClProcessHost::OnChildDied can be done in the destructor.

BUG=98716
Review URL: http://codereview.chromium.org/8771041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112877 0039d316-1c4b-4281-b951-d872f2087c98