WTF/std normalization: replace WTF::Vector::first() with ::front()

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc.
  * All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012, 2013 Intel Corporation. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
@@ skipping 143 matching lines @@
     // The canvas should always have an initial save frame, to support
     // resetting the top level matrix and clip.
     DCHECK_GT(skCanvas->getSaveCount(), 1);
 
     if (m_contextLostMode == NotLostContext) {
       DCHECK_EQ(static_cast<size_t>(skCanvas->getSaveCount()),
                 m_stateStack.size() + 1);
     }
   }
 #endif
-  CHECK(m_stateStack.first()
+  CHECK(m_stateStack.front()
             .get());  // Temporary for investigating crbug.com/648510
 }
 
 bool CanvasRenderingContext2D::isAccelerated() const {
   if (!canvas()->hasImageBuffer())
     return false;
   return canvas()->buffer()->isAccelerated();
 }
 
 void CanvasRenderingContext2D::stop() {
@@ skipping 979 matching lines @@
   }
   return true;
 }
 
 void CanvasRenderingContext2D::resetUsageTracking() {
   UsageCounters newCounters;
   m_usageCounters = newCounters;
 }
 
 }  // namespace blink