Return reference from styleEngine() accessor.

Source/core/html/canvas/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 1938 matching lines @@
     };
 
     StyleResolver& styleResolver = canvas()->document().ensureStyleResolver();
     styleResolver.applyPropertiesToStyle(properties, WTF_ARRAY_LENGTH(properties), newStyle.get());
 
 #if !ENABLE(OILPAN)
     if (state().m_realizedFont)
         static_cast<CSSFontSelector*>(state().m_font.fontSelector())->unregisterForInvalidationCallbacks(&modifiableState());
 #endif
     modifiableState().m_font = newStyle->font();
-    modifiableState().m_font.update(canvas()->document().styleEngine()->fontSelector());
+    modifiableState().m_font.update(canvas()->document().styleEngine().fontSelector());
     modifiableState().m_realizedFont = true;
-    canvas()->document().styleEngine()->fontSelector()->registerForInvalidationCallbacks(&modifiableState());
+    canvas()->document().styleEngine().fontSelector()->registerForInvalidationCallbacks(&modifiableState());
 }
 
 String CanvasRenderingContext2D::textAlign() const
 {
     return textAlignName(state().m_textAlign);
 }
 
 void CanvasRenderingContext2D::setTextAlign(const String& s)
 {
     TextAlign align;
@@ skipping 517 matching lines @@
         if (imageType == NonOpaqueImage)
             return;
         if (alpha < 0xFF)
             return;
     }
 
     canvas()->buffer()->willOverwriteCanvas();
 }
 
 } // namespace blink