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

third_party/WebKit/Source/core/paint/BoxBorderPainter.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 "core/paint/BoxBorderPainter.h"
 
 #include "core/paint/BoxPainter.h"
 #include "core/paint/ObjectPainter.h"
 #include "core/paint/PaintInfo.h"
 #include "core/style/BorderEdge.h"
@@ skipping 448 matching lines @@
       const unsigned edgeAlpha = edge.color.alpha();
 
       DCHECK_GT(edgeAlpha, 0u);
       DCHECK_GE(edgeAlpha, currentAlpha);
       if (edgeAlpha != currentAlpha) {
         opacityGroups.append(OpacityGroup(edgeAlpha));
         currentAlpha = edgeAlpha;
       }
 
       DCHECK(!opacityGroups.isEmpty());
-      OpacityGroup& currentGroup = opacityGroups.last();
+      OpacityGroup& currentGroup = opacityGroups.back();
       currentGroup.sides.append(side);
       currentGroup.edgeFlags |= edgeFlagForSide(side);
     }
 
     DCHECK(!opacityGroups.isEmpty());
   }
 };
 
 void BoxBorderPainter::drawDoubleBorder(GraphicsContext& context,
                                         const LayoutRect& borderRect) const {
@@ skipping 814 matching lines @@
     FloatPoint secondQuad[4];
     secondQuad[0] = quad[0];
     secondQuad[1] = FloatPoint(quad[0].x() - r1 * cx, quad[0].y() - r1 * cy);
     secondQuad[2] = quad[2];
     secondQuad[3] = quad[3];
     clipQuad(graphicsContext, secondQuad, secondMiter == SoftMiter);
   }
 }
 
 }  // namespace blink