diff --git a/mozilla/string/src/nsSharedBufferList.cpp b/mozilla/string/src/nsSharedBufferList.cpp
index 84342e07535..85fa31b3dfd 100755
--- a/mozilla/string/src/nsSharedBufferList.cpp
+++ b/mozilla/string/src/nsSharedBufferList.cpp
@@ -145,6 +145,13 @@ nsSharedBufferList::UnlinkBuffer( Buffer* aBufferToUnlink )
   }
 
 
+void
+nsSharedBufferList::DiscardSuffix( PRUint32 /* aLengthToDiscard */ )
+  {
+    // XXX
+  }
+
+
 
 #if 0
 template <class CharT>
diff --git a/mozilla/xpcom/ds/nsSharedBufferList.cpp b/mozilla/xpcom/ds/nsSharedBufferList.cpp
index 84342e07535..85fa31b3dfd 100755
--- a/mozilla/xpcom/ds/nsSharedBufferList.cpp
+++ b/mozilla/xpcom/ds/nsSharedBufferList.cpp
@@ -145,6 +145,13 @@ nsSharedBufferList::UnlinkBuffer( Buffer* aBufferToUnlink )
   }
 
 
+void
+nsSharedBufferList::DiscardSuffix( PRUint32 /* aLengthToDiscard */ )
+  {
+    // XXX
+  }
+
+
 
 #if 0
 template <class CharT>
diff --git a/mozilla/xpcom/string/src/nsSharedBufferList.cpp b/mozilla/xpcom/string/src/nsSharedBufferList.cpp
index 84342e07535..85fa31b3dfd 100755
--- a/mozilla/xpcom/string/src/nsSharedBufferList.cpp
+++ b/mozilla/xpcom/string/src/nsSharedBufferList.cpp
@@ -145,6 +145,13 @@ nsSharedBufferList::UnlinkBuffer( Buffer* aBufferToUnlink )
   }
 
 
+void
+nsSharedBufferList::DiscardSuffix( PRUint32 /* aLengthToDiscard */ )
+  {
+    // XXX
+  }
+
+
 
 #if 0
 template <class CharT>