Break StyleImage dependency on LayoutObject

third_party/WebKit/Source/core/css/CSSPaintImageGenerator.cpp

Index: third_party/WebKit/Source/core/css/CSSPaintImageGenerator.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSPaintImageGenerator.cpp b/third_party/WebKit/Source/core/css/CSSPaintImageGenerator.cpp
index 76a6d775bce17e1c65377dfe76bd8b3259296bdc..b9976e7596e50028a9b997c5b9f2a51955162afe 100644
--- a/third_party/WebKit/Source/core/css/CSSPaintImageGenerator.cpp
+++ b/third_party/WebKit/Source/core/css/CSSPaintImageGenerator.cpp
@@ -22,7 +22,7 @@ void CSSPaintImageGenerator::Init(
 
 // static
 CSSPaintImageGenerator* CSSPaintImageGenerator::Create(const String& name,
-                                                       Document& document,
+                                                       const Document& document,
                                                        Observer* observer) {
   DCHECK(g_create_function);
   return g_create_function(name, document, observer);