diff --git a/mozilla/layout/style/nsCSSScanner.cpp b/mozilla/layout/style/nsCSSScanner.cpp
index 1b624d661c6..d0dec735c0a 100644
--- a/mozilla/layout/style/nsCSSScanner.cpp
+++ b/mozilla/layout/style/nsCSSScanner.cpp
@@ -527,13 +527,6 @@ PRInt32 nsCSSScanner::Peek(nsresult& aErrorCode)
   return PRInt32(mPushback[mPushbackCount - 1]);
 }
 
-void nsCSSScanner::Unread()
-{
-  NS_PRECONDITION((mLastRead >= 0), "double pushback");
-  Pushback(PRUnichar(mLastRead));
-  mLastRead = -1;
-}
-
 void nsCSSScanner::Pushback(PRUnichar aChar)
 {
   if (mPushbackCount == mPushbackSize) { // grow buffer
@@ -560,7 +553,7 @@ PRBool nsCSSScanner::LookAhead(nsresult& aErrorCode, PRUnichar aChar)
   if (ch == aChar) {
     return PR_TRUE;
   }
-  Unread();
+  Pushback(ch);
   return PR_FALSE;
 }
 
@@ -576,7 +569,7 @@ PRBool nsCSSScanner::EatWhiteSpace(nsresult& aErrorCode)
       eaten = PR_TRUE;
       continue;
     }
-    Unread();
+    Pushback(ch);
     break;
   }
   return eaten;
@@ -598,7 +591,7 @@ PRBool nsCSSScanner::EatNewline(nsresult& aErrorCode)
   } else if (ch == '\n') {
     eaten = PR_TRUE;
   } else {
-    Unread();
+    Pushback(ch);
   }
   return eaten;
 }
@@ -820,7 +813,7 @@ PRBool nsCSSScanner::NextURL(nsresult& aErrorCode, nsCSSToken& aToken)
         // ")". This is an invalid url spec.
         ok = PR_FALSE;
       } else if (ch == ')') {
-        Unread();
+        Pushback(ch);
         // All done
         break;
       } else {
@@ -858,7 +851,7 @@ nsCSSScanner::ParseAndAppendEscape(nsresult& aErrorCode, nsString& aOutput)
         break;
       }
       if (ch >= 256 || (lexTable[ch] & (IS_HEX_DIGIT | IS_WHITESPACE)) == 0) {
-        Unread();
+        Pushback(ch);
         break;
       } else if ((lexTable[ch] & IS_HEX_DIGIT) != 0) {
         if ((lexTable[ch] & IS_DIGIT) != 0) {
@@ -936,7 +929,7 @@ PRBool nsCSSScanner::GatherIdent(nsresult& aErrorCode, PRInt32 aChar,
     } else if ((aChar > 255) || ((gLexTable[aChar] & IS_IDENT) != 0)) {
       aIdent.Append(PRUnichar(aChar));
     } else {
-      Unread();
+      Pushback(aChar);
       break;
     }
   }
@@ -963,7 +956,7 @@ PRBool nsCSSScanner::ParseRef(nsresult& aErrorCode,
   }
 
   // No ident chars after the '#'.  Just unread |ch| and get out of here.
-  Unread();
+  Pushback(ch);
   return PR_TRUE;
 }
 
@@ -1039,7 +1032,7 @@ PRBool nsCSSScanner::ParseNumber(nsresult& aErrorCode, PRInt32 c,
       ident.SetLength(0);
     } else {
       // Put back character that stopped numeric scan
-      Unread();
+      Pushback(c);
       if (!gotDot) {
         aToken.mInteger = ident.ToInteger(&ec);
         aToken.mIntegerValid = PR_TRUE;
diff --git a/mozilla/layout/style/nsCSSScanner.h b/mozilla/layout/style/nsCSSScanner.h
index 1efe2b79a41..12fb1b7f705 100644
--- a/mozilla/layout/style/nsCSSScanner.h
+++ b/mozilla/layout/style/nsCSSScanner.h
@@ -200,7 +200,6 @@ class nsCSSScanner {
 protected:
   PRInt32 Read(nsresult& aErrorCode);
   PRInt32 Peek(nsresult& aErrorCode);
-  void Unread();
   void Pushback(PRUnichar aChar);
   PRBool LookAhead(nsresult& aErrorCode, PRUnichar aChar);
   PRBool EatWhiteSpace(nsresult& aErrorCode);