Migrate chrome_net_benchmarking_message_filter to mojo

chrome/common/net_benchmarking.mojom

+// 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 chrome.mojom;
+
+interface NetBenchmarking {
+  // Message sent from the renderer to the browser to request that the browser
+  // close all sockets.  Used for debugging/testing.
+  [Sync]
+  CloseCurrentConnections() => ();
+
+  // Message sent from the renderer to the browser to request that the browser
+  // clear the cache.  Used for debugging/testing.
+  // |result| is the returned status from the operation.
+  [Sync]
+  ClearCache() => (int32 result);
+
+  // Message sent from the renderer to the browser to request that the browser
+  // clear the host cache.  Used for debugging/testing.
+  [Sync]
+  ClearHostResolverCache() => ();
+  
+  // Message sent from the renderer to the browser to request that the browser
+  // clear the predictor cache.  Used for debugging/testing.
+  [Sync]
+  ClearPredictorCache() => ();
+};