Remove attributeCount() / attributeAt() API from Element

Source/core/editing/EditingStyle.cpp

Index: Source/core/editing/EditingStyle.cpp
diff --git a/Source/core/editing/EditingStyle.cpp b/Source/core/editing/EditingStyle.cpp
index 21b1c93b6bf6f94809dc443962bb7ed101a9863d..c03e333199dab53484c64f4a457e6b09c566c93d 100644
--- a/Source/core/editing/EditingStyle.cpp
+++ b/Source/core/editing/EditingStyle.cpp
@@ -933,8 +933,8 @@ bool EditingStyle::elementIsStyledSpanOrHTMLEquivalent(const HTMLElement* elemen
     }
 
     // font with color attribute, span with style attribute, etc...
-    ASSERT(matchedAttributes <= element->attributeCount());
-    return matchedAttributes >= element->attributeCount();
+    ASSERT(matchedAttributes <= element->attributes().size());
+    return matchedAttributes >= element->attributes().size();
 }
 
 void EditingStyle::prepareToApplyAt(const Position& position, ShouldPreserveWritingDirection shouldPreserveWritingDirection)