[iOS Clean] Added HTTP authentication dialog support.

ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h

Index: ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h
diff --git a/ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h b/ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h
new file mode 100644
index 0000000000000000000000000000000000000000..9c1c0db33c5079d8e7ed2820593b68393ba3d3b3
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h
@@ -0,0 +1,17 @@
+// Copyright 2017 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 IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_HTTP_AUTH_DIALOG_COMMANDS_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_HTTP_AUTH_DIALOG_COMMANDS_H_
+
+// Commands used to dismiss HTTP authentication dialogs.
+@protocol HTTPAuthDialogDismissalCommands<NSObject>
+
+// Called when the HTTP authentication flow has been completed to stop the
+// dialog's coordinator.
+- (void)dismissHTTPAuthDialog;
+
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_HTTP_AUTH_DIALOG_COMMANDS_H_