Communicate OS and CPU to SymbolSupplier (#107). r=bryner

Interface change: moved a few fields around in ProcessState; added new
arguments to Stackwalker and SymbolSupplier.

http://groups.google.com/group/airbag-dev/browse_thread/thread/17e4a48ec3ede932


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@101 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/processor/process_state.cc

@@ -55,10 +55,7 @@ void ProcessState::Clear() {
     delete *iterator;
   }
   threads_.clear();
-  os_.clear();
-  os_version_.clear();
-  cpu_.clear();
-  cpu_info_.clear();
+  system_info_.Clear();
   delete modules_;
   modules_ = NULL;
 }