Add GetLiveVars to PPB_Testing_Dev. Fix leaks it uncovered.

ppapi/shared_impl/var_tracker.cc

Index: ppapi/shared_impl/var_tracker.cc
diff --git a/ppapi/shared_impl/var_tracker.cc b/ppapi/shared_impl/var_tracker.cc
index 287e7b1c6b596c6681e764a8d32be5578ba779aa..58c715cf27d2550ab9231c0737bc550b7bb92fb0 100644
--- a/ppapi/shared_impl/var_tracker.cc
+++ b/ppapi/shared_impl/var_tracker.cc
@@ -149,6 +149,17 @@ PP_Var VarTracker::MakeArrayBufferPPVar(uint32 size_in_bytes) {
   return array_buffer->GetPPVar();
 }
 
+std::vector<PP_Var> VarTracker::GetLiveVars() {
+  std::vector<PP_Var> var_vector;
+  var_vector.reserve(live_vars_.size());
+  for (VarMap::const_iterator iter = live_vars_.begin();
+       iter != live_vars_.end();
+       ++iter) {
+    var_vector.push_back(iter->second.var->GetPPVar());
+  }
+  return var_vector;
+}
+
 void VarTracker::TrackedObjectGettingOneRef(VarMap::const_iterator obj) {
   // Anybody using tracked objects should override this.
   NOTREACHED();