Strengthen range checks in minidump.cc (#173).  r=bryner
Strengthen range checks in minidump.cc (#173).  r=bryner

http://groups.google.com/group/google-breakpad-dev/browse_thread/thread/ad373296bfe5e08b


git-svn-id: 7939527bf0a06ad24ad020f729d5600cb42ed5d7@173 4c0a9323-5329-0410-9bdc-e9ce6186880e

mikewied/breakpad,mikewied/breakpad,mikewied/breakpad,mikewied/breakpad,mikewied/breakpad,mikewied/breakpad