Convert visitedlink to use mojo.

components/visitedlink/common/BUILD.gn

 # 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.
 
+import("//mojo/public/tools/bindings/mojom.gni")
+
 static_library("common") {
   sources = [
     "visitedlink_common.cc",
     "visitedlink_common.h",
-    "visitedlink_message_generator.cc",
-    "visitedlink_message_generator.h",
-    "visitedlink_messages.h",
+  ]
+  public_deps = [
+    ":interfaces",
   ]
 
   deps = [
+    ":interfaces",
     "//base",
     "//content/public/common",
     "//ipc",
     "//url",
   ]
 }
+
+mojom("interfaces") {
+  sources = [
+    "visitedlink.mojom",
+  ]
+}