Fix memory leak in ServiceTestMessageHandler.

runtime/vm/service_test.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 
 #include "include/dart_tools_api.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
@@ skipping 15 matching lines @@
 
 class ServiceTestMessageHandler : public MessageHandler {
  public:
   ServiceTestMessageHandler() : _msg(NULL) {}
 
   ~ServiceTestMessageHandler() { free(_msg); }
 
   MessageStatus HandleMessage(Message* message) {
     if (_msg != NULL) {
       free(_msg);
+      _msg = NULL;
     }
 
     // Parse the message.
     Object& response_obj = Object::Handle();
     if (message->IsRaw()) {
       response_obj = message->raw_obj();
     } else {
       Thread* thread = Thread::Current();
       MessageSnapshotReader reader(message->data(), message->len(), thread);
       response_obj = reader.ReadObject();
     }
     if (response_obj.IsString()) {
       String& response = String::Handle();
       response ^= response_obj.raw();
       _msg = strdup(response.ToCString());
     } else {
       ASSERT(response_obj.IsArray());
       Array& response_array = Array::Handle();
       response_array ^= response_obj.raw();
       ASSERT(response_array.Length() == 1);
       ExternalTypedData& response = ExternalTypedData::Handle();
       response ^= response_array.At(0);
       _msg = strdup(reinterpret_cast<char*>(response.DataAddr(0)));
     }
 
+    delete message;
+
     return kOK;
   }
 
   const char* msg() const { return _msg; }
 
   virtual Isolate* isolate() const { return Isolate::Current(); }
 
  private:
   char* _msg;
 };
@@ skipping 715 matching lines @@
   EXPECT_EQ(MessageHandler::kOK, handler.HandleNextMessage());
   // Expect error.
   EXPECT_SUBSTRING("\"error\"", handler.msg());
 }
 
 #endif  // !defined(TARGET_ARCH_ARM64)
 
 #endif  // !PRODUCT
 
 }  // namespace dart