Create MetricsPrivateDelegate for metricsPrivate behavior

extensions/shell/browser/api/metrics_private/shell_metrics_private_delegate.cc

Index: extensions/shell/browser/api/metrics_private/shell_metrics_private_delegate.cc
diff --git a/extensions/shell/browser/api/metrics_private/shell_metrics_private_delegate.cc b/extensions/shell/browser/api/metrics_private/shell_metrics_private_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..74c0b0c5fe498e199db2668077be9aa0af1ffe4d
--- /dev/null
+++ b/extensions/shell/browser/api/metrics_private/shell_metrics_private_delegate.cc
@@ -0,0 +1,14 @@
+// Copyright 2016 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 "extensions/shell/browser/api/metrics_private/shell_metrics_private_delegate.h"
+
+namespace extensions {
+
+bool ShellMetricsPrivateDelegate::IsCrashReportingEnabled() {
+  // Metrics service is not yet implemented for app_shell.
+  return false;
+}
+
+}  // namespace extensions