WTF/std normalization: replace WTF::Vector::last with ::back

third_party/WebKit/Source/platform/graphics/compositing/PaintArtifactCompositor.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/graphics/compositing/PaintArtifactCompositor.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/playback/display_item_list.h"
@@ skipping 353 matching lines @@
 
   void setupRootTransformNode();
   void setupRootClipNode();
   void setupRootEffectNode();
   void setupRootScrollNode();
 
   int compositorIdForTransformNode(const TransformPaintPropertyNode*);
   int compositorIdForClipNode(const ClipPaintPropertyNode*);
   int switchToEffectNode(const EffectPaintPropertyNode& nextEffect);
   int compositorIdForCurrentEffectNode() const {
-    return m_effectStack.last().id;
+    return m_effectStack.back().id;
   }
   int compositorIdForScrollNode(const ScrollPaintPropertyNode*);
 
   // Scroll offset has special treatment in the transform and scroll trees.
   void updateScrollOffset(int layerId, int scrollId);
 
  private:
   void buildEffectNodesRecursively(const EffectPaintPropertyNode* nextEffect);
 
   cc::TransformTree& transformTree() { return m_propertyTrees.transform_tree; }
   cc::ClipTree& clipTree() { return m_propertyTrees.clip_tree; }
   cc::EffectTree& effectTree() { return m_propertyTrees.effect_tree; }
   cc::ScrollTree& scrollTree() { return m_propertyTrees.scroll_tree; }
 
   const EffectPaintPropertyNode* currentEffectNode() const {
-    return m_effectStack.last().effect;
+    return m_effectStack.back().effect;
   }
 
   // Property trees which should be updated by the manager.
   cc::PropertyTrees& m_propertyTrees;
 
   // Layer to which transform "owner" layers should be added. These will not
   // have any actual children, but at present must exist in the tree.
   cc::Layer* m_rootLayer;
 
   // Maps from Blink-side property tree nodes to cc property node indices.
@@ skipping 413 matching lines @@
   m_contentLayerClients.clear();
   m_contentLayerClients.swap(newContentLayerClients);
 
   // Mark the property trees as having been rebuilt.
   layerTree->property_trees()->sequence_number = kPropertyTreeSequenceNumber;
   layerTree->property_trees()->needs_rebuild = false;
   layerTree->property_trees()->ResetCachedData();
 }
 
 }  // namespace blink