Make chrome GN build work in component mode.

content/utility/BUILD.gn

Index: content/utility/BUILD.gn
diff --git a/content/utility/BUILD.gn b/content/utility/BUILD.gn
index 8fa734d2c3ed09dc499bf00479b370b6902e90ef..5a23de87f053969c07adce9607f7d87bbb52ea45 100644
--- a/content/utility/BUILD.gn
+++ b/content/utility/BUILD.gn
@@ -3,6 +3,10 @@
 # found in the LICENSE file.
 
 source_set("utility") {
+  # Only the public target should depend on this. All other targets (even
+  # internal content ones) should depend on the public one.
+  visibility = [ "//content/public/utility:utility_sources" ]
+
   sources = [
     "in_process_utility_thread.cc",
     "in_process_utility_thread.h",
@@ -16,8 +20,8 @@ source_set("utility") {
   deps = [
     "//base",
     "//content:export",
-    "//content/public/child",
-    "//content/public/common",
+    "//content/public/child:child_sources",
+    "//content/public/common:common_sources",
     "//courgette:courgette_lib",
     "//mojo/public/interfaces/application",
     "//third_party/WebKit/public:blink_headers",