Add GetLiveVars to PPB_Testing_Dev. Fix leaks it uncovered.

webkit/plugins/ppapi/message_channel.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "webkit/plugins/ppapi/message_channel.h"
 
 #include <cstdlib>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 166 matching lines @@
                           const NPVariant* args, uint32 arg_count,
                           NPVariant* result) {
   if (!np_obj)
     return false;
 
   // We only handle a function called postMessage.
   if (IdentifierIsPostMessage(name) && (arg_count == 1)) {
     MessageChannel& message_channel(ToMessageChannel(np_obj));
     PP_Var argument(NPVariantToPPVar(message_channel.instance(), &args[0]));
     message_channel.PostMessageToNative(argument);
+    PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(argument);
     return true;
   }
   // Other method calls we will pass to the passthrough object, if we have one.
   NPObject* passthrough = ToMessageChannel(np_obj).passthrough_object();
   if (passthrough) {
     return WebBindings::invoke(NULL, passthrough, name, args, arg_count,
                                result);
   }
   return false;
 }
@@ skipping 216 matching lines @@
   //   SetPassthroughObject(passthrough_object());
   if (passthrough_object_)
     WebBindings::releaseObject(passthrough_object_);
 
   passthrough_object_ = passthrough;
 }
 
 }  // namespace ppapi
 }  // namespace webkit