Convert Web Store Inline Install IPCs to mojo

chrome/common/extensions/mojo/inline_install_traits.h

Index: chrome/common/extensions/mojo/inline_install_traits.h
diff --git a/chrome/common/extensions/mojo/inline_install_traits.h b/chrome/common/extensions/mojo/inline_install_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..84c2dda556aa605baacb551496f2c62100ed119a
--- /dev/null
+++ b/chrome/common/extensions/mojo/inline_install_traits.h
@@ -0,0 +1,13 @@
+// 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/common/extensions/api/webstore/webstore_api_constants.h"
+#include "chrome/common/extensions/webstore_install_result.h"
+#include "ipc/ipc_message_macros.h"
+
+IPC_ENUM_TRAITS_MAX_VALUE(

[Devlin, 2017/04/12 01:16:07]

It still seems like we should only need this *or* the entries in
extension_messages.h, but we can let a mojo guru enlighten us. :)

+    extensions::api::webstore::InstallStage,
+    extensions::api::webstore::InstallStage::INSTALL_STAGE_INSTALLING)
+IPC_ENUM_TRAITS_MAX_VALUE(extensions::webstore_install::Result,
+                          extensions::webstore_install::RESULT_LAST)