code clean-up, issue crbug.com/260966 is fixed with

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 0ec0919383334de58eee0d141085680b06701b40..6173c80a37f0872459e1af423320231da9532545 100644
--- a/Source/core/css/resolver/FontBuilder.cpp
+++ b/Source/core/css/resolver/FontBuilder.cpp
@@ -70,10 +70,7 @@ FontBuilder::FontBuilder()
 
 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());
+    ASSERT(document.frame());
     m_document = &document;
     m_useSVGZoomRules = useSVGZoomRules;
     m_style = style;