Create a about handler component.

components/about_handler/BUILD.gn

Index: components/about_handler/BUILD.gn
diff --git a/chrome/installer/launcher_support/BUILD.gn b/components/about_handler/BUILD.gn
similarity index 55%
copy from chrome/installer/launcher_support/BUILD.gn
copy to components/about_handler/BUILD.gn
index 9abab50df0aefabdc299b6795e0fee8f77ee83f2..eeaff47f027871b388ba842f9d444148a76b9aa9 100644
--- a/chrome/installer/launcher_support/BUILD.gn
+++ b/components/about_handler/BUILD.gn
@@ -2,13 +2,16 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("launcher_support") {
+source_set("about_handler") {
   sources = [
-    "chrome_launcher_support.cc",
-    "chrome_launcher_support.h",
+    "about_protocol_handler.cc",
+    "about_protocol_handler.h",
+    "url_request_about_job.cc",
+    "url_request_about_job.h",
   ]
 
   deps = [
     "//base",
+    "//net",
   ]
 }