Change RenderObject::style(bool) to accept an enum instead

Source/core/rendering/RenderObjectInlines.h

 // 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.
 
 #ifndef RenderObjectInlines_h
 #define RenderObjectInlines_h
 
 #include "core/dom/StyleEngine.h"
 #include "core/rendering/RenderObject.h"
 
 namespace WebCore {
 
 // The following methods are inlined for performance but not put in
 // RenderObject.h because that would unnecessarily tie RenderObject.h
 // to StyleEngine.h for all users of RenderObject.h that don't use
 // these methods.
 
 inline RenderStyle* RenderObject::firstLineStyle() const
 {
     return document().styleEngine()->usesFirstLineRules() ? cachedFirstLineStyle() : style();
 }
 
-inline RenderStyle* RenderObject::style(bool firstLine) const
+inline RenderStyle* RenderObject::style(OwnOrFirstLineStyle firstLine) const
 {
-    return firstLine ? firstLineStyle() : style();
+    return firstLine == OwnStyle ? firstLineStyle() : style();
 }
 
 }
 
 #endif