Add a test case to test disabling remote connection.

chrome/test/remoting/remote_desktop_browsertest.h

Index: chrome/test/remoting/remote_desktop_browsertest.h
diff --git a/chrome/test/remoting/remote_desktop_browsertest.h b/chrome/test/remoting/remote_desktop_browsertest.h
index 54f58c3703ecb2c32992068c649d5711a37445d9..73c7c98476e9704147277f4140d3d9a058930d33 100644
--- a/chrome/test/remoting/remote_desktop_browsertest.h
+++ b/chrome/test/remoting/remote_desktop_browsertest.h
@@ -340,6 +340,12 @@ class RemoteDesktopBrowserTest : public extensions::PlatformAppBrowserTest {
   static bool IsHostActionComplete(
       content::WebContents* client_web_content, std::string host_action_var);
 
+  // Test if the remoting app mode is equal to the given mode
+  bool IsAppModeEqualTo(const std::string& mode);
+
+  // Disable remote connection while the remote connection is enabled
+  void DisableRemoteConnection();
+
  private:
   // Fields