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

third_party/WebKit/Source/modules/canvas2d/BaseRenderingContext2D.h

 // 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.
 
 #ifndef BaseRenderingContext2D_h
 #define BaseRenderingContext2D_h
 
 #include "bindings/modules/v8/CSSImageValueOrHTMLImageElementOrHTMLVideoElementOrHTMLCanvasElementOrImageBitmapOrOffscreenCanvas.h"
 #include "bindings/modules/v8/StringOrCanvasGradientOrCanvasPattern.h"
 #include "core/html/ImageData.h"
@@ skipping 278 matching lines @@
     UsageCounters();
   };
 
   const UsageCounters& getUsage();
 
  protected:
   BaseRenderingContext2D();
 
   CanvasRenderingContext2DState& modifiableState();
   const CanvasRenderingContext2DState& state() const {
-    return *m_stateStack.last();
+    return *m_stateStack.back();
   }
 
   bool computeDirtyRect(const FloatRect& localBounds, SkIRect*);
   bool computeDirtyRect(const FloatRect& localBounds,
                         const SkIRect& transformedClipBounds,
                         SkIRect*);
 
   template <typename DrawFunc, typename ContainsFunc>
   bool draw(const DrawFunc&,
             const ContainsFunc&,
@@ skipping 156 matching lines @@
   foregroundPaint.setBlendMode(SkBlendMode::kSrcOver);
   c->setMatrix(ctm);
   drawFunc(c, &foregroundPaint);
   c->restore();
   c->setMatrix(ctm);
 }
 
 }  // namespace blink
 
 #endif  // BaseRenderingContext2D_h