Improve process launch handle sharing API.

components/browser_watcher/watcher_client_win.h

Index: components/browser_watcher/watcher_client_win.h
diff --git a/components/browser_watcher/watcher_client_win.h b/components/browser_watcher/watcher_client_win.h
index 0a6cee0a88bed9758178e92b0b3f1c83cc7eee13..e3e5dadddacc93c78ebb4123fe27ac11c9d70c5c 100644
--- a/components/browser_watcher/watcher_client_win.h
+++ b/components/browser_watcher/watcher_client_win.h
@@ -42,18 +42,7 @@ class WatcherClient {
   // 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_;