Fix a bunch of pyauto tests

chrome/test/automation/proxy_launcher.cc

 // Copyright (c) 2012 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/test/automation/proxy_launcher.h"
 
 #include <vector>
 
 #include "base/environment.h"
 #include "base/file_util.h"
@@ skipping 408 matching lines @@
 
 #ifdef WAIT_FOR_DEBUGGER_ON_OPEN
   command_line->AppendSwitch(switches::kDebugOnStart);
 #endif
 
   // Force the app to always exit when the last browser window is closed.
   command_line->AppendSwitch(switches::kDisableZeroBrowsersOpenForTests);
 
   // Allow file:// access on ChromeOS.
   command_line->AppendSwitch(switches::kAllowFileAccess);
+
+  // The tests assume that file:// URIs can freely access other file:// URIs.
+  command_line->AppendSwitch(switches::kAllowFileAccessFromFiles);
 }
 
 bool ProxyLauncher::LaunchBrowserHelper(const LaunchState& state,
                                         bool main_launch,
                                         bool wait,
                                         base::ProcessHandle* process) {
   CommandLine command_line(state.command);
 
   // Add command line arguments that should be applied to all UI tests.
   PrepareTestCommandline(&command_line, state.include_testing_id);
@@ skipping 156 matching lines @@
   return LaunchBrowserAndServer(state, wait_for_initial_loads);
 }
 
 void AnonymousProxyLauncher::TerminateConnection() {
   CloseBrowserAndServer();
 }
 
 std::string AnonymousProxyLauncher::PrefixedChannelID() const {
   return channel_id_;
 }