Revert of Refactor thread_local.h's TLS Implementation to use ThreadLocalStorage

base/threading/thread_local_android.cc

+// Copyright 2014 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 "base/threading/thread_local.h"
+
+namespace base {
+namespace internal {
+
+// static
+void ThreadLocalPlatform::AllocateSlot(SlotType* slot) {
+  slot->Initialize(nullptr);
+}
+
+// static
+void ThreadLocalPlatform::FreeSlot(SlotType slot) {
+  slot.Free();
+}
+
+// static
+void* ThreadLocalPlatform::GetValueFromSlot(SlotType slot) {
+  return slot.Get();
+}
+
+// static
+void ThreadLocalPlatform::SetValueInSlot(SlotType slot, void* value) {
+  slot.Set(value);
+}
+
+}  // namespace internal
+}  // namespace base