Move content_settings_observer.h, content_settings_provider.h, content_settings_rule.* to the compo…

components/content_settings/core/browser/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.
+
+static_library("browser") {
+  sources = [
+    "content_settings_details.cc",
+    "content_settings_details.h",
+    "content_settings_observer.h",
+    "content_settings_provider.h",
+    "content_settings_rule.cc",
+    "content_settings_rule.h",
+  ]
+
+  deps = [
+    "//base",
+    "//components/content_settings/core/common",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "content_settings_rule_unittest.cc",
+  ]
+
+  deps = [
+    ":browser",
+    "//testing/gtest",
+  ]
+}