Use base::GlobalDescriptors::kBaseDescriptor instead of magic number 3.

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 17 matching lines @@
 #include "chrome/test/base/test_launcher_utils.h"
 #include "chrome/test/base/test_switches.h"
 #include "chrome/test/ui/ui_test.h"
 #include "content/public/common/process_type.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_descriptors.h"
 #include "sql/connection.h"
 
 #if defined(OS_POSIX)
 #include <signal.h>
+#include "base/posix/global_descriptors.h"
 #endif
 
 namespace {
 
 // Passed as value of kTestType.
 const char kUITestType[] = "ui";
 
 // Copies the contents of the given source directory to the given dest
 // directory. This is somewhat different than CopyDirectory in base which will
 // copies "source/" to "dest/source/". This version will copy "source/*" to
@@ skipping 448 matching lines @@
   options.wait = wait;
 
 #if defined(OS_WIN)
   options.start_hidden = !state.show_window;
 #elif defined(OS_POSIX)
   int ipcfd = -1;
   file_util::ScopedFD ipcfd_closer(&ipcfd);
   base::FileHandleMappingVector fds;
   if (main_launch && automation_proxy_.get()) {
     ipcfd = automation_proxy_->channel()->TakeClientFileDescriptor();
-    fds.push_back(std::make_pair(ipcfd, kPrimaryIPCChannel + 3));
+    fds.push_back(std::make_pair(ipcfd,
+        kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor));
     options.fds_to_remap = &fds;
   }
 #endif
 
   return base::LaunchProcess(command_line, options, process);
 }
 
 AutomationProxy* ProxyLauncher::automation() const {
   EXPECT_TRUE(automation_proxy_.get());
   return automation_proxy_.get();
@@ skipping 113 matching lines @@
   return LaunchBrowserAndServer(state, wait_for_initial_loads);
 }
 
 void AnonymousProxyLauncher::TerminateConnection() {
   CloseBrowserAndServer();
 }
 
 std::string AnonymousProxyLauncher::PrefixedChannelID() const {
   return channel_id_;
 }