Remove mojo/shell and (most) service implementations

mojo/services/test_service/test_request_tracker.mojom

-// Copyright 2014 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 mojo.test {
-
-// Various counters that services can periodically send to a
-// TestTrackedRequestService for recording.
-struct ServiceStats {
-  uint64 num_new_requests;
-  double health;
-};
-
-// A per-service summary of all the ServiceStats the
-// TestTrackedRequestService has observed.
-struct ServiceReport {
-  string? service_name;
-  uint64 total_requests;
-  double mean_health;
-};
-
-// A simple interface to obtain a "report" from all services that have
-// opted to connect themselves to for request tracking.
-interface TestTrackedRequestService {
-  GetReport() => (array<ServiceReport?>? report);
-};
-
-// TestRequestTracker records ServiceStats for an individual service
-// connection for aggregation in a TestTrackedRequestService.
-[Client=TestRequestTrackerClient]
-interface TestRequestTracker {
-  // Upload a ServiceStats for tracking.
-  RecordStats(uint64 client_id, ServiceStats? stats);
-};
-
-// The client-side contract for uploading ServiceStats to TestRequestTracker.
-interface TestRequestTrackerClient {
-  const uint64 kInvalidId = 0;
-  // Handshake to tell the client its global identifier and get the name.
-  SetIdAndReturnName(uint64 id) => (string? service_name);
-};
-
-}  // module mojo.test