Remove attributeCount() / attributeAt() API from Element

Source/core/editing/ApplyStyleCommand.cpp

Index: Source/core/editing/ApplyStyleCommand.cpp
diff --git a/Source/core/editing/ApplyStyleCommand.cpp b/Source/core/editing/ApplyStyleCommand.cpp
index a5a5df35facd8abe3c7bc2829451f647d519217d..c64b46bb4494025af566aee031855a98ef2fe881 100644
--- a/Source/core/editing/ApplyStyleCommand.cpp
+++ b/Source/core/editing/ApplyStyleCommand.cpp
@@ -84,8 +84,8 @@ static bool hasNoAttributeOrOnlyStyleAttribute(const Element* element, ShouldSty
         || !element->inlineStyle() || element->inlineStyle()->isEmpty()))
         matchedAttributes++;
 
-    ASSERT(matchedAttributes <= element->attributeCount());
-    return matchedAttributes == element->attributeCount();
+    ASSERT(matchedAttributes <= element->attributes().size());
+    return matchedAttributes == element->attributes().size();
 }
 
 bool isStyleSpanOrSpanWithOnlyStyleAttribute(const Element* element)