Update Source/platform/ to assume Oilpan only.

third_party/WebKit/Source/platform/MemoryPurgeController.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 "platform/MemoryPurgeController.h"
 
 #include "base/sys_info.h"
 #include "platform/TraceEvent.h"
 #include "platform/graphics/ImageDecodingStore.h"
 #include "public/platform/Platform.h"
@@ skipping 11 matching lines @@
 
 DEFINE_TRACE(MemoryPurgeClient)
 {
 }
 
 MemoryPurgeController::MemoryPurgeController()
     : m_deviceKind(base::SysInfo::IsLowEndDevice() ? DeviceKind::LowEnd : DeviceKind::NotSpecified)
 {
 }
 
-MemoryPurgeController::~MemoryPurgeController()
-{
-}
-
 void MemoryPurgeController::purgeMemory()
 {
     // TODO(bashi): Add UMA
     TRACE_EVENT0("blink", "MemoryPurgeController::purgeMemory");
     for (auto& client : m_clients)
         client->purgeMemory(m_deviceKind);
     WTF::Partitions::decommitFreeableMemory();
 }
 
 DEFINE_TRACE(MemoryPurgeController)
 {
-#if ENABLE(OILPAN)
     visitor->trace(m_clients);
-#endif
 }
 
 } // namespace blink