Correct the change to the fast-load version. r/sr=bz

content/xul/document/public/nsIXULPrototypeCache.h

@@ -129,7 +129,7 @@ const char XUL_FASTLOAD_FILE_BASENAME[] = "XUL";
 // Increase the subtractor when changing version, say when changing the
 // (opaque to FastLoad code) format of JS script, function, regexp, etc.
 // XDR serializations.
-#define XUL_FASTLOAD_FILE_VERSION       (0xfeedbeef - 12)
+#define XUL_FASTLOAD_FILE_VERSION       (0xfeedbeef - 13)
 
 #define XUL_SERIALIZATION_BUFFER_SIZE   (64 * 1024)
 #define XUL_DESERIALIZATION_BUFFER_SIZE (8 * 1024)

xpcom/io/nsFastLoadFile.h

@@ -141,7 +141,7 @@ typedef PRUint32 NSFastLoadOID;         // nsFastLoadFooter::mObjectMap index
 
 #define MFL_FILE_VERSION_0      0
 #define MFL_FILE_VERSION_1      1000
-#define MFL_FILE_VERSION        5       // multiple script languages
+#define MFL_FILE_VERSION        4       // fix to note singletons in object map
 
 /**
  * Compute Fletcher's 16-bit checksum over aLength bytes starting at aBuffer,