Merge trunk r1050 to chrome_23 branch.

Fix a parsing error in the Linux dump writer.

Original Review URL: https://breakpad.appspot.com/464002
Review URL: https://breakpad.appspot.com/471002

git-svn-id: http://google-breakpad.googlecode.com/svn/branches/chrome_23@1054 4c0a9323-5329-0410-9bdc-e9ce6186880e