Return reference from styleEngine() accessor.

Source/core/css/DragUpdateTest.cpp

 // Copyright 2014 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 "config.h"
 #include "core/dom/Element.h"
 #include "core/dom/StyleEngine.h"
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLElement.h"
@@ skipping 14 matching lines @@
     HTMLDocument& document = toHTMLDocument(dummyPageHolder->document());
     document.documentElement()->setInnerHTML("<style>div {width:100px;height:100px} div:-webkit-drag { background-color: green }</style>"
         "<div>"
         "<span></span>"
         "<span></span>"
         "<span></span>"
         "<span></span>"
         "</div>", ASSERT_NO_EXCEPTION);
 
     document.view()->updateLayoutAndStyleIfNeededRecursive();
-    unsigned startCount = document.styleEngine()->resolverAccessCount();
+    unsigned startCount = document.styleEngine().resolverAccessCount();
 
     document.documentElement()->renderer()->updateDragState(true);
     document.view()->updateLayoutAndStyleIfNeededRecursive();
 
-    unsigned accessCount = document.styleEngine()->resolverAccessCount() - startCount;
+    unsigned accessCount = document.styleEngine().resolverAccessCount() - startCount;
 
     ASSERT_EQ(1U, accessCount);
 }
 
 TEST(DragUpdateTest, ChildrenOrSiblingsAffectedByDragUpdate)
 {
     // Check that when dragging the div in the document below, you get a
     // full subtree style recalc.
 
     OwnPtr<DummyPageHolder> dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
     HTMLDocument& document = toHTMLDocument(dummyPageHolder->document());
     document.documentElement()->setInnerHTML("<style>div {width:100px;height:100px} div:-webkit-drag span { background-color: green }</style>"
         "<div>"
         "<span></span>"
         "<span></span>"
         "<span></span>"
         "<span></span>"
         "</div>", ASSERT_NO_EXCEPTION);
 
     document.updateLayout();
-    unsigned startCount = document.styleEngine()->resolverAccessCount();
+    unsigned startCount = document.styleEngine().resolverAccessCount();
 
     document.documentElement()->renderer()->updateDragState(true);
     document.updateLayout();
 
-    unsigned accessCount = document.styleEngine()->resolverAccessCount() - startCount;
+    unsigned accessCount = document.styleEngine().resolverAccessCount() - startCount;
 
     ASSERT_EQ(5U, accessCount);
 }
 
 } // namespace