Have FontBuilder::initForStyleResolve() take a Document reference

Source/core/css/resolver/FontBuilder.cpp

Index: Source/core/css/resolver/FontBuilder.cpp
diff --git a/Source/core/css/resolver/FontBuilder.cpp b/Source/core/css/resolver/FontBuilder.cpp
index 8d3f5aa5cc80c035aab006b20e1e3ec400d83b01..684f36d47c9f2bfbacf137cf6284f1cd6a9ab45d 100644
--- a/Source/core/css/resolver/FontBuilder.cpp
+++ b/Source/core/css/resolver/FontBuilder.cpp
@@ -65,13 +65,13 @@ FontBuilder::FontBuilder()
 {
 }
 
-void FontBuilder::initForStyleResolve(const Document* document, RenderStyle* style, bool useSVGZoomRules)
+void FontBuilder::initForStyleResolve(const Document& document, RenderStyle* style, bool useSVGZoomRules)
 {
     // All documents need to be in a frame (and thus have access to Settings)
     // for style-resolution to make sense.
     // Unfortunately SVG Animations currently violate this: crbug.com/260966
     // ASSERT(m_document->frame());
-    m_document = document;
+    m_document = &document;
     m_useSVGZoomRules = useSVGZoomRules;
     m_style = style;
     m_fontDirty = false;