cc: Remove some unnecessary const scoped_refptr&.

cc/tiles/picture_layer_tiling_set.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/tiles/picture_layer_tiling_set.h"
 
 #include <stddef.h>
 
 #include <limits>
 #include <set>
@@ skipping 45 matching lines @@
       skewport_extrapolation_limit_in_content_pixels_(
           skewport_extrapolation_limit_in_content_pixels),
       tree_(tree),
       client_(client) {}
 
 PictureLayerTilingSet::~PictureLayerTilingSet() {
 }
 
 void PictureLayerTilingSet::CopyTilingsAndPropertiesFromPendingTwin(
     const PictureLayerTilingSet* pending_twin_set,
-    const scoped_refptr<DisplayListRasterSource>& raster_source,
+    scoped_refptr<DisplayListRasterSource> raster_source,
     const Region& layer_invalidation) {
   if (pending_twin_set->tilings_.empty()) {
     // If the twin (pending) tiling set is empty, it was not updated for the
     // current frame. So we drop tilings from our set as well, instead of
     // leaving behind unshared tilings that are all non-ideal.
     RemoveAllTilings();
     return;
   }
 
   bool tiling_sort_required = false;
@@ skipping 78 matching lines @@
 
     // This is needed for cases where the live tiles rect didn't change but
     // recordings exist in the raster source that did not exist on the last
     // raster source.
     tiling->CreateMissingTilesInLiveTilesRect();
   }
   VerifyTilings(nullptr /* pending_twin_set */);
 }
 
 void PictureLayerTilingSet::UpdateRasterSourceDueToLCDChange(
-    const scoped_refptr<DisplayListRasterSource>& raster_source,
+    scoped_refptr<DisplayListRasterSource> raster_source,
     const Region& layer_invalidation) {
   for (const auto& tiling : tilings_) {
     tiling->SetRasterSourceAndResize(raster_source);
     tiling->Invalidate(layer_invalidation);
     // Since the invalidation changed, we need to create any missing tiles in
     // the live tiles rect again.
     tiling->CreateMissingTilesInLiveTilesRect();
   }
 }
 
@@ skipping 410 matching lines @@
     case LOWER_THAN_LOW_RES:
       range = TilingRange(low_res_range.end, tilings_size);
       break;
   }
 
   DCHECK_LE(range.start, range.end);
   return range;
 }
 
 }  // namespace cc