Bug 1359492 - remove code that incorrectly sets the apply to dir path when staging an update. r=mhowell

This was missed during the removal of the gonk code.

toolkit/xre/nsUpdateDriver.cpp

@@ -590,7 +590,6 @@ ApplyUpdate(nsIFile *greDir, nsIFile *updateDir, nsIFile *appDir, int appArgc,
       return;
     }
     applyToDirPath = NS_ConvertUTF16toUTF8(applyToDirPathW);
-    rv = updatedDir->GetNativePath(applyToDirPath);
 #else
     rv = updatedDir->GetNativePath(applyToDirPath);
 #endif