Improve process launch handle sharing API.

components/browser_watcher/watcher_client_win.h

 // Copyright (c) 2014 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.
 
 #ifndef COMPONENTS_BROWSER_WATCHER_WATCHER_CLIENT_WIN_H_
 #define COMPONENTS_BROWSER_WATCHER_WATCHER_CLIENT_WIN_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/process/process.h"
@@ skipping 24 matching lines @@
   void LaunchWatcher();
 
   // Ensures that |handle| may be inherited by the watcher process. |handle|
   // must still be inheritable, and it's the client's responsibility to
   // communicate the value of |handle| to the launched process.
   void AddInheritedHandle(HANDLE handle);
 
   // Returns the launched process.
   const base::Process& process() const { return process_; }
 
-  // Accessors, exposed only for testing.
-  bool use_legacy_launch() const { return use_legacy_launch_; }
-  void set_use_legacy_launch(bool use_legacy_launch) {
-      use_legacy_launch_ = use_legacy_launch;
-  }
-
  private:
-  // If true, the watcher process will be launched with XP legacy handle
-  // inheritance. This is not thread safe and can leak random handles into the
-  // child process, but it's the best we can do on XP.
-  bool use_legacy_launch_;
-
   // The CommandLineGenerator passed to the constructor.
   CommandLineGenerator command_line_generator_;
 
   // A handle to the launched watcher process. Valid after a successful
   // LaunchWatcher() call.
   base::Process process_;
 
   std::vector<HANDLE> inherited_handles_;
 
   DISALLOW_COPY_AND_ASSIGN(WatcherClient);
 };
 
 }  // namespace browser_watcher
 
 #endif  // COMPONENTS_BROWSER_WATCHER_WATCHER_CLIENT_WIN_H_