Add more BUILD.gn files to build these targets with GN.

components/favicon_base/BUILD.gn

Index: components/favicon_base/BUILD.gn
diff --git a/components/favicon_base/BUILD.gn b/components/favicon_base/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..3d4f63820fd79c4a250f2af5b8795bb96b94b99f
--- /dev/null
+++ b/components/favicon_base/BUILD.gn
@@ -0,0 +1,20 @@
+# 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.
+
+source_set("favicon_base") {
+  sources = [
+    "favicon_callback.h",
+    "favicon_types.cc",
+    "favicon_types.h",
+    "select_favicon_frames.cc",
+    "select_favicon_frames.h",
+  ]
+
+  deps = [
+    "//base",
+    "//skia",
+    "//ui/gfx",
+    "//url",
+  ]
+}