Move ViewHostMsg_CreateWindow to mojom

content/public/common/window_container_type.mojom

Index: content/public/common/window_container_type.mojom
diff --git a/content/public/common/window_container_type.mojom b/content/public/common/window_container_type.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..c96302d220eb5bf5fb89588fbd0047bb46b7bb93
--- /dev/null
+++ b/content/public/common/window_container_type.mojom
@@ -0,0 +1,18 @@
+// 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.
+
+module content.mojom;
+
+enum WindowContainerType {
+  // A window shown in popup or tab.
+  NORMAL = 0,
+
+  // A window run as a hidden "background" page.
+  BACKGROUND,
+
+  // A window run as a hidden "background" page that wishes to be started
+  // upon browser launch and run beyond the lifetime of the pages that
+  // reference it.
+  PERSISTENT,
+};