Work on "gn check" of content/*

content/public/utility/BUILD.gn

Index: content/public/utility/BUILD.gn
diff --git a/content/public/utility/BUILD.gn b/content/public/utility/BUILD.gn
index 7813b393b10c8ac22f463f03eb15496af5933ea9..a1ab07682d28cb2c86cb6044be93f344faccf1cd 100644
--- a/content/public/utility/BUILD.gn
+++ b/content/public/utility/BUILD.gn
@@ -15,8 +15,15 @@ source_set("utility") {
   deps = [
     "//base",
     "//content:export",
+    "//content/public/common",
     "//content/utility",
     "//ipc",
   ]
+
+  allow_circular_includes_from = [
+    # This target is a pair with content/browser. They always go together and
+    # include headers from each other.
+    "//content/utility",
+  ]
 }