Bug #308281 --> We want to remove the XPI work around by deleting the file: bug307259.js

from the default prefs directory now that we no longer need to work around it.
sr=dbaron a=me

browser/installer/unix/browser.jst

@@ -45,6 +45,7 @@ function upgradeCleanup()
   deleteThisFile("Program",	      "defaults/pref/security-prefs.js");
   deleteThisFile("Program",	      "defaults/pref/unix.js");
   deleteThisFile("Program",	      "defaults/pref/xpinstall.js");
+  deleteThisFile("Program",	      "defaults/pref/bug307259.js");
   deleteThisFile("Program",	      "defaults/profile/panels.rdf");
   deleteThisFolder("Program",	    "defaults/profile/US");
   

browser/installer/windows/browser.jst

@@ -19,6 +19,7 @@ function upgradeCleanup()
   deleteThisFile("Program",     "defaults/pref/security-prefs.js");
   deleteThisFile("Program",     "defaults/pref/winpref.js");
   deleteThisFile("Program",     "defaults/pref/xpinstall.js");
+  deleteThisFile("Program",     "defaults/pref/bug307259.js");
   deleteThisFolder("Program",   "defaults/profile/US");
 
   // Delete dictionary.com search plugin