Componentize renderer side of DNS prefetching.

components/predictor/common/BUILD.gn

Index: components/predictor/common/BUILD.gn
diff --git a/components/bookmarks/common/BUILD.gn b/components/predictor/common/BUILD.gn
similarity index 56%
copy from components/bookmarks/common/BUILD.gn
copy to components/predictor/common/BUILD.gn
index 283b85be724ed6d8d2211e9cfe03f86baac13aea..93e49a889dae2d14b8b79e598acc5d51df71c01c 100644
--- a/components/bookmarks/common/BUILD.gn
+++ b/components/predictor/common/BUILD.gn
@@ -2,12 +2,13 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# GYP version: components/predictor.gypi:predictor
 source_set("common") {
   sources = [
-    "bookmark_constants.cc",
-    "bookmark_constants.h",
-    "bookmark_pref_names.cc",
-    "bookmark_pref_names.h",
+    "predictor_common.h",
+    "predictor_message_generator.cc",
+    "predictor_message_generator.h",
+    "predictor_messages.h",
   ]
 
   deps = [