Flip the "unique file:// URI origin" flag to on. Add the...

chrome/common/chrome_switches.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 
 namespace switches {
 
 // -----------------------------------------------------------------------------
 // Can't find the switch you are looking for? try looking in
 // base/base_switches.cc instead.
 // -----------------------------------------------------------------------------
 
 // Activate (make foreground) myself on launch.  Helpful when Chrome
 // is launched on the command line (e.g. by Selenium).  Only needed on Mac.
 const char kActivateOnLaunch[] = "activate-on-launch";
 
+// By default, file:// URIs cannot read other file:// URIs. This is an
+// override for developers who need the old behavior for testing.
+const char kAllowFileAccessFromFiles[] = "allow-file-access-from-files";
+
 // Allows debugging of sandboxed processes (see zygote_main_linux.cc).
 const char kAllowSandboxDebugging[]         = "allow-sandbox-debugging";
 
 // Enable web inspector for all windows, even if they're part of the browser.
 // Allows us to use our dev tools to debug browser windows itself.
 const char kAlwaysEnableDevTools[]          = "always-enable-dev-tools";
 
 // Specifies that the associated value should be launched in "application" mode.
 const char kApp[]                           = "app";
 
@@ skipping 766 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead,
 // please put them in alphabetical order above, or in order inside the
 // appropriate ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches