Convert content ConnectionFilter to OnBindInterface

content/common/child.mojom

Index: content/common/child.mojom
diff --git a/content/common/child.mojom b/content/common/child.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..15524dded27ec86162caec3b5d11cc96a1332f4f
--- /dev/null
+++ b/content/common/child.mojom
@@ -0,0 +1,9 @@
+// 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.
+
+module content.mojom;
+
+// This interface encapsulates a pipe between a child and browser processes
+// that each side uses to monitor the lifetime of the connection.
+interface Child {};