Revert of arc: enable Android tracing from chrome://tracing in dev mode

components/arc/common/tracing.mojom

Index: components/arc/common/tracing.mojom
diff --git a/components/arc/common/tracing.mojom b/components/arc/common/tracing.mojom
deleted file mode 100644
index e27d89ba0b3ec3afa18dd26f1874e57c9341da68..0000000000000000000000000000000000000000
--- a/components/arc/common/tracing.mojom
+++ /dev/null
@@ -1,18 +0,0 @@
-// 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.
-
-// Next MinVersion: 1
-
-module arc.mojom;
-
-interface TracingInstance {
-  // Queries available tracing categories in the container.
-  QueryAvailableCategories@0() => (array<string> categories);
-
-  // Starts tracing in the container with the given categories.
-  StartTracing@1(array<string> categories) => (bool success);
-
-  // Stops tracing in the container.
-  StopTracing@2() => (bool success);
-};