OnionSoup: Move idle_manager.mojom from public/platform/modules to pu…

…blic/mojom

This CL moves idle_manager.mojom from public/platform/modules to
public/mojom/ to gather mojom files to mojom folder and updates
paths for idle_manager.mojom.

Bug: 919393
Change-Id: I89d955f870cf55df9fbaf37816c8e4615a8148d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529508
Commit-Queue: Julie Jeongeun Kim <jkim@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642852}

idle-detection/interceptor.https.html

@@ -6,7 +6,7 @@
 <script src="/gen/layout_test_data/mojo/public/js/mojo_bindings.js"></script>
 <script src="/gen/mojo/public/mojom/base/string16.mojom.js"></script>
 <script src="/gen/mojo/public/mojom/base/time.mojom.js"></script>
-<script src="/gen/third_party/blink/public/platform/modules/idle/idle_manager.mojom.js"></script>
+<script src="/gen/third_party/blink/public/mojom/idle/idle_manager.mojom.js"></script>
 <script src="mock.js"></script>
 <script>
 'use strict';