Fix compiler warning C4245: signed/unsigned mismatch when converting between types.  Patch by Sorin Jianu.  r=me,bryner
Fix compiler warning C4245: signed/unsigned mismatch when converting between
types.  Patch by Sorin Jianu.  r=me,bryner


git-svn-id: 7939527bf0a06ad24ad020f729d5600cb42ed5d7@217 4c0a9323-5329-0410-9bdc-e9ce6186880e

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