Don't cache MemoryInfo instance on ConsoleMemory object.

Source/core/timing/ConsoleMemory.cpp

 // Copyright 2015 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 "config.h"
 #include "core/timing/ConsoleMemory.h"
 
 #include "core/frame/Console.h"
 #include "core/timing/MemoryInfo.h"
 
 namespace blink {
 
-DEFINE_TRACE(ConsoleMemory)
-{
-    visitor->trace(m_memory);
-    HeapSupplement<Console>::trace(visitor);
-}
-
 // static
 ConsoleMemory& ConsoleMemory::from(Console& console)
 {
     ConsoleMemory* supplement = static_cast<ConsoleMemory*>(HeapSupplement<Console>::from(console, supplementName()));
     if (!supplement) {
         supplement = new ConsoleMemory();
         provideTo(console, supplementName(), supplement);
     }
     return *supplement;
 }
 
 // static
 MemoryInfo* ConsoleMemory::memory(Console& console)
 {
     return ConsoleMemory::from(console).memory();
 }
 
 MemoryInfo* ConsoleMemory::memory()
 {
-    if (!m_memory)
-        m_memory = MemoryInfo::create();
-
-    return m_memory.get();
+    return MemoryInfo::create();
 }
 
 } // namespace blink