diff --git a/mozilla/string/obsolete/nsString.h b/mozilla/string/obsolete/nsString.h
index 2aaf5f703df..03fb430869b 100644
--- a/mozilla/string/obsolete/nsString.h
+++ b/mozilla/string/obsolete/nsString.h
@@ -775,10 +775,10 @@ public:
 private:
     // NOT TO BE IMPLEMENTED
     //  these signatures help clients not accidentally call the wrong thing helped by C++ automatic integral promotion
-  void AssignWithConversion( char );
-  void AssignWithConversion( const char*, PRInt32=-1 );
-  void AppendWithConversion( char );
-  void InsertWithConversion( char, PRUint32 );
+  void AssignWithConversion( char ) { }
+  void AssignWithConversion( const char*, PRInt32=-1 ) { }
+  void AppendWithConversion( char ) { }
+  void InsertWithConversion( char, PRUint32 ) { }
 };
 
 #if 0//def NEW_STRING_APIS
diff --git a/mozilla/string/obsolete/nsString2.h b/mozilla/string/obsolete/nsString2.h
index bafcb690f3e..4e0d313fa8a 100644
--- a/mozilla/string/obsolete/nsString2.h
+++ b/mozilla/string/obsolete/nsString2.h
@@ -870,11 +870,11 @@ public:
 private:
     // NOT TO BE IMPLEMENTED
     //  these signatures help clients not accidentally call the wrong thing helped by C++ automatic integral promotion
-  void AssignWithConversion( PRUnichar );
-  void AssignWithConversion( const PRUnichar*, PRInt32=-1 );
-  void AppendWithConversion( PRUnichar );
-  void AppendWithConversion( const PRUnichar*, PRInt32=-1 );
-  void InsertWithConversion( const PRUnichar*, PRUint32, PRInt32=-1 );
+  void AssignWithConversion( PRUnichar ) { }
+  void AssignWithConversion( const PRUnichar*, PRInt32=-1 ) { }
+  void AppendWithConversion( PRUnichar ) { }
+  void AppendWithConversion( const PRUnichar*, PRInt32=-1 ) { }
+  void InsertWithConversion( const PRUnichar*, PRUint32, PRInt32=-1 ) { }
 };
 
 #if 0//def NEW_STRING_APIS
diff --git a/mozilla/xpcom/ds/nsString.h b/mozilla/xpcom/ds/nsString.h
index 2aaf5f703df..03fb430869b 100644
--- a/mozilla/xpcom/ds/nsString.h
+++ b/mozilla/xpcom/ds/nsString.h
@@ -775,10 +775,10 @@ public:
 private:
     // NOT TO BE IMPLEMENTED
     //  these signatures help clients not accidentally call the wrong thing helped by C++ automatic integral promotion
-  void AssignWithConversion( char );
-  void AssignWithConversion( const char*, PRInt32=-1 );
-  void AppendWithConversion( char );
-  void InsertWithConversion( char, PRUint32 );
+  void AssignWithConversion( char ) { }
+  void AssignWithConversion( const char*, PRInt32=-1 ) { }
+  void AppendWithConversion( char ) { }
+  void InsertWithConversion( char, PRUint32 ) { }
 };
 
 #if 0//def NEW_STRING_APIS
diff --git a/mozilla/xpcom/ds/nsString2.h b/mozilla/xpcom/ds/nsString2.h
index bafcb690f3e..4e0d313fa8a 100644
--- a/mozilla/xpcom/ds/nsString2.h
+++ b/mozilla/xpcom/ds/nsString2.h
@@ -870,11 +870,11 @@ public:
 private:
     // NOT TO BE IMPLEMENTED
     //  these signatures help clients not accidentally call the wrong thing helped by C++ automatic integral promotion
-  void AssignWithConversion( PRUnichar );
-  void AssignWithConversion( const PRUnichar*, PRInt32=-1 );
-  void AppendWithConversion( PRUnichar );
-  void AppendWithConversion( const PRUnichar*, PRInt32=-1 );
-  void InsertWithConversion( const PRUnichar*, PRUint32, PRInt32=-1 );
+  void AssignWithConversion( PRUnichar ) { }
+  void AssignWithConversion( const PRUnichar*, PRInt32=-1 ) { }
+  void AppendWithConversion( PRUnichar ) { }
+  void AppendWithConversion( const PRUnichar*, PRInt32=-1 ) { }
+  void InsertWithConversion( const PRUnichar*, PRUint32, PRInt32=-1 ) { }
 };
 
 #if 0//def NEW_STRING_APIS
diff --git a/mozilla/xpcom/string/obsolete/nsString.h b/mozilla/xpcom/string/obsolete/nsString.h
index 2aaf5f703df..03fb430869b 100644
--- a/mozilla/xpcom/string/obsolete/nsString.h
+++ b/mozilla/xpcom/string/obsolete/nsString.h
@@ -775,10 +775,10 @@ public:
 private:
     // NOT TO BE IMPLEMENTED
     //  these signatures help clients not accidentally call the wrong thing helped by C++ automatic integral promotion
-  void AssignWithConversion( char );
-  void AssignWithConversion( const char*, PRInt32=-1 );
-  void AppendWithConversion( char );
-  void InsertWithConversion( char, PRUint32 );
+  void AssignWithConversion( char ) { }
+  void AssignWithConversion( const char*, PRInt32=-1 ) { }
+  void AppendWithConversion( char ) { }
+  void InsertWithConversion( char, PRUint32 ) { }
 };
 
 #if 0//def NEW_STRING_APIS
diff --git a/mozilla/xpcom/string/obsolete/nsString2.h b/mozilla/xpcom/string/obsolete/nsString2.h
index bafcb690f3e..4e0d313fa8a 100644
--- a/mozilla/xpcom/string/obsolete/nsString2.h
+++ b/mozilla/xpcom/string/obsolete/nsString2.h
@@ -870,11 +870,11 @@ public:
 private:
     // NOT TO BE IMPLEMENTED
     //  these signatures help clients not accidentally call the wrong thing helped by C++ automatic integral promotion
-  void AssignWithConversion( PRUnichar );
-  void AssignWithConversion( const PRUnichar*, PRInt32=-1 );
-  void AppendWithConversion( PRUnichar );
-  void AppendWithConversion( const PRUnichar*, PRInt32=-1 );
-  void InsertWithConversion( const PRUnichar*, PRUint32, PRInt32=-1 );
+  void AssignWithConversion( PRUnichar ) { }
+  void AssignWithConversion( const PRUnichar*, PRInt32=-1 ) { }
+  void AppendWithConversion( PRUnichar ) { }
+  void AppendWithConversion( const PRUnichar*, PRInt32=-1 ) { }
+  void InsertWithConversion( const PRUnichar*, PRUint32, PRInt32=-1 ) { }
 };
 
 #if 0//def NEW_STRING_APIS