Remove parts of //cc we aren't using

cc/resources/raster_tile_priority_queue_required.cc

-// 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 "cc/resources/raster_tile_priority_queue_required.h"
-
-#include "cc/resources/tiling_set_raster_queue_required.h"
-
-namespace cc {
-
-RasterTilePriorityQueueRequired::RasterTilePriorityQueueRequired() {
-}
-
-RasterTilePriorityQueueRequired::~RasterTilePriorityQueueRequired() {
-}
-
-void RasterTilePriorityQueueRequired::Build(
-    const std::vector<PictureLayerImpl::Pair>& paired_layers,
-    Type type) {
-  DCHECK_NE(static_cast<int>(type), static_cast<int>(Type::ALL));
-  for (const auto& pair : paired_layers) {
-    PictureLayerTilingSet* tiling_set = nullptr;
-    if (type == Type::REQUIRED_FOR_DRAW && pair.active)
-      tiling_set = pair.active->picture_layer_tiling_set();
-    else if (type == Type::REQUIRED_FOR_ACTIVATION && pair.pending)
-      tiling_set = pair.pending->picture_layer_tiling_set();
-
-    if (!tiling_set)
-      continue;
-
-    scoped_ptr<TilingSetRasterQueueRequired> tiling_set_queue(
-        new TilingSetRasterQueueRequired(tiling_set, type));
-    if (tiling_set_queue->IsEmpty())
-      continue;
-    tiling_set_queues_.push_back(tiling_set_queue.Pass());
-  }
-}
-
-bool RasterTilePriorityQueueRequired::IsEmpty() const {
-  return tiling_set_queues_.empty();
-}
-
-Tile* RasterTilePriorityQueueRequired::Top() {
-  DCHECK(!IsEmpty());
-  return tiling_set_queues_.back()->Top();
-}
-
-void RasterTilePriorityQueueRequired::Pop() {
-  DCHECK(!IsEmpty());
-  tiling_set_queues_.back()->Pop();
-  if (tiling_set_queues_.back()->IsEmpty())
-    tiling_set_queues_.pop_back();
-}
-
-}  // namespace cc