Make sure getAttribute() / setAttribute() callers use AtomicStrings

Source/core/html/HTMLTableSectionElement.h

Index: Source/core/html/HTMLTableSectionElement.h
diff --git a/Source/core/html/HTMLTableSectionElement.h b/Source/core/html/HTMLTableSectionElement.h
index e309697659467798b4c78b72a4b6da641f057ef9..02d55167adbc8941f007affe18e8de579d7656ab 100644
--- a/Source/core/html/HTMLTableSectionElement.h
+++ b/Source/core/html/HTMLTableSectionElement.h
@@ -41,17 +41,17 @@ public:
 
     int numRows() const;
 
-    String align() const;
-    void setAlign(const String&);
+    const AtomicString& align() const;
+    void setAlign(const AtomicString&);
 
-    String ch() const;
-    void setCh(const String&);
+    const AtomicString& ch() const;
+    void setCh(const AtomicString&);
 
-    String chOff() const;
-    void setChOff(const String&);
+    const AtomicString& chOff() const;
+    void setChOff(const AtomicString&);
 
-    String vAlign() const;
-    void setVAlign(const String&);
+    const AtomicString& vAlign() const;
+    void setVAlign(const AtomicString&);
 
     PassRefPtr<HTMLCollection> rows();