Remove parts of //cc we aren't using

cc/resources/memory_history.cc

-// Copyright 2012 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 "cc/resources/memory_history.h"
-
-#include <limits>
-
-namespace cc {
-
-// static
-scoped_ptr<MemoryHistory> MemoryHistory::Create() {
-  return make_scoped_ptr(new MemoryHistory());
-}
-
-MemoryHistory::MemoryHistory() {}
-
-void MemoryHistory::SaveEntry(const MemoryHistory::Entry& entry) {
-  ring_buffer_.SaveToBuffer(entry);
-}
-
-void MemoryHistory::GetMinAndMax(size_t* min, size_t* max) const {
-  *min = std::numeric_limits<size_t>::max();
-  *max = 0;
-
-  for (RingBufferType::Iterator it = ring_buffer_.Begin(); it; ++it) {
-    size_t bytes_total = it->total_bytes_used;
-
-    if (bytes_total < *min)
-      *min = bytes_total;
-    if (bytes_total > *max)
-      *max = bytes_total;
-  }
-
-  if (*min > *max)
-    *min = *max;
-}
-
-}  // namespace cc