Get SimpleStringDictionary compiling on Linux.

BUG=http://code.google.com/p/chromium/issues/detail?id=77656

Review URL: https://breakpad.appspot.com/564002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1155 4c0a9323-5329-0410-9bdc-e9ce6186880e
Fix Bigcluster build error with minidump.cc after r1147.

A=Jia Ji <jijia@google.com>
Original review: https://breakpad.appspot.com/563002/

Review URL: https://breakpad.appspot.com/564003

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1156 4c0a9323-5329-0410-9bdc-e9ce6186880e