Change the system-level EULA dialog to not use GET parameters with res:// urls. Instead use the d...

chrome/installer/setup/eula/oem.js

 function setInnerFrame() {
-  var regex = new RegExp("\\?innerframe=\"?([^&#\"]*)\"?");
-  var results = regex.exec(window.location.href);
-  if(results && results[1])
-    document.getElementById('ifr').src = results[1];
+  var inner_frame = window.dialogArguments;
+  if (inner_frame) {
+    document.getElementById('ifr').src = inner_frame;
+  }
 }
 
 function checkAccept(f) {
   if (f.accept.checked) {
     window.returnValue = 6;
   } else {
     window.returnValue = 1;
   }
   window.close();
 }
 
 function resize() {
   var ifr = document.getElementById('ifr');
   var footer = document.getElementById('footer');
   
   ifr.height = footer.offsetTop - ifr.offsetTop;
   setInnerFrame();
 }
 
 window.onresize = resize;
 window.onload = resize;