Discard pinning an app with non-empty launcher id.

chrome/browser/ui/ash/app_launcher_id.cc

+// 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.
+
+#include "chrome/browser/ui/ash/app_launcher_id.h"
+
+#include "base/logging.h"
+
+namespace ash {
+namespace launcher {
+
+AppLauncherId::AppLauncherId(const std::string& app_id,
+                             const std::string& launch_id)
+    : app_id_(app_id), launch_id_(launch_id) {
+  DCHECK(!app_id.empty());
+}
+
+AppLauncherId::AppLauncherId(const std::string& app_id) : app_id_(app_id) {
+  DCHECK(!app_id.empty());
+}
+
+AppLauncherId::AppLauncherId() {}
+
+AppLauncherId::~AppLauncherId() {}
+
+}  // namespace launcher
+}  // namespace ash