Get and return String by const-ref if used as rvalue

third_party/WebKit/Source/bindings/tests/results/core/TestDictionary.h

Index: third_party/WebKit/Source/bindings/tests/results/core/TestDictionary.h
diff --git a/third_party/WebKit/Source/bindings/tests/results/core/TestDictionary.h b/third_party/WebKit/Source/bindings/tests/results/core/TestDictionary.h
index 58166c537bf5fb3acaf0e46ba51fbd391a49d827..d31735546fc83566a6a46686d1e9a1e386b3abe4 100644
--- a/third_party/WebKit/Source/bindings/tests/results/core/TestDictionary.h
+++ b/third_party/WebKit/Source/bindings/tests/results/core/TestDictionary.h
@@ -83,8 +83,8 @@ class CORE_EXPORT TestDictionary : public IDLDictionaryBase {
   void setElementOrNullMemberToNull();
 
   bool hasEnumMember() const;
-  String enumMember() const;
-  void setEnumMember(String);
+  const String& enumMember() const;
+  void setEnumMember(const String&);
 
   bool hasEnumSequenceMember() const;
   const Vector<String>& enumSequenceMember() const;
@@ -140,12 +140,12 @@ class CORE_EXPORT TestDictionary : public IDLDictionaryBase {
   void setStringArrayMember(const Vector<String>&);
 
   bool hasStringMember() const;
-  String stringMember() const;
-  void setStringMember(String);
+  const String& stringMember() const;
+  void setStringMember(const String&);
 
   bool hasStringOrNullMember() const;
-  String stringOrNullMember() const;
-  void setStringOrNullMember(String);
+  const String& stringOrNullMember() const;
+  void setStringOrNullMember(const String&);
   void setStringOrNullMemberToNull();
 
   bool hasStringSequenceMember() const;