Move ranker_model_loader to a new component.

components/machine_intelligence/BUILD.gn

+# 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.
+
+static_library("machine_intelligence") {
+  sources = [
+    "ranker_model.cc",
+    "ranker_model.h",
+    "ranker_model_loader.cc",
+    "ranker_model_loader.h",
+    "ranker_url_fetcher.cc",
+    "ranker_url_fetcher.h",
+  ]
+
+  deps = [
+    "//base",
+    "//components/data_use_measurement/core",
+    "//components/machine_intelligence/proto",
+    "//net",
+    "//url",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+
+  sources = [
+    "ranker_model_loader_unittest.cc",
+    "ranker_model_unittest.cc",
+  ]
+
+  deps = [
+    ":machine_intelligence",
+    "//base",
+    "//components/machine_intelligence/proto",
+    "//net:test_support",
+    "//testing/gtest",
+  ]
+}