Move FaviconAttributes to UI

ios/chrome/browser/ui/favicon/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.
+
+source_set("favicon") {
+  sources = [
+    "favicon_attributes_provider.h",
+    "favicon_attributes_provider.mm",
+  ]
+  deps = [
+    ":favicon_ui",
+    "//base",
+    "//components/favicon/core",
+    "//components/favicon_base",
+    "//url",
+  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}
+
+source_set("favicon_ui") {
+  sources = [
+    "favicon_attributes.h",
+    "favicon_attributes.mm",
+    "favicon_view.h",
+    "favicon_view.mm",
+  ]
+  deps = [
+    "//base",
+    "//ios/chrome/browser/ui",
+  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}