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

third_party/WebKit/Source/platform/testing/TestPaintArtifact.cpp

 // Copyright 2016 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/testing/TestPaintArtifact.h"
 
 #include "cc/layers/layer.h"
 #include "platform/graphics/paint/DisplayItemClient.h"
 #include "platform/graphics/paint/DrawingDisplayItem.h"
 #include "platform/graphics/paint/ForeignLayerDisplayItem.h"
@@ skipping 45 matching lines @@
   properties.transform = transform;
   properties.clip = clip;
   properties.effect = effect;
   properties.scroll = scroll;
   return chunk(properties);
 }
 
 TestPaintArtifact& TestPaintArtifact::chunk(
     const PaintChunkProperties& properties) {
   if (!m_paintChunks.isEmpty())
-    m_paintChunks.last().endIndex = m_displayItemList.size();
+    m_paintChunks.back().endIndex = m_displayItemList.size();
   PaintChunk chunk;
   chunk.beginIndex = m_displayItemList.size();
   chunk.properties = properties;
   m_paintChunks.append(chunk);
   return *this;
 }
 
 TestPaintArtifact& TestPaintArtifact::rectDrawing(const FloatRect& bounds,
                                                   Color color) {
   std::unique_ptr<DummyRectClient> client =
@@ skipping 16 matching lines @@
       size);
   m_dummyClients.append(std::move(client));
   return *this;
 }
 
 const PaintArtifact& TestPaintArtifact::build() {
   if (m_built)
     return m_paintArtifact;
 
   if (!m_paintChunks.isEmpty())
-    m_paintChunks.last().endIndex = m_displayItemList.size();
+    m_paintChunks.back().endIndex = m_displayItemList.size();
   m_paintArtifact = PaintArtifact(std::move(m_displayItemList),
                                   std::move(m_paintChunks), true);
   m_built = true;
   return m_paintArtifact;
 }
 
 }  // namespace blink