Componentize renderer side of DNS prefetching.

components/dns_prefetch/common/BUILD.gn

Index: components/dns_prefetch/common/BUILD.gn
diff --git a/components/bookmarks/common/BUILD.gn b/components/dns_prefetch/common/BUILD.gn
similarity index 50%
copy from components/bookmarks/common/BUILD.gn
copy to components/dns_prefetch/common/BUILD.gn
index 320d463ffb7e6d2db0b9e1b957bf6c33251b9c2b..82a02ac924e55e3a34d88fb60a3f3657fce25f15 100644
--- a/components/bookmarks/common/BUILD.gn
+++ b/components/dns_prefetch/common/BUILD.gn
@@ -2,20 +2,18 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# GYP version: components/dns_prefetch.gypi:predictor
 source_set("common") {
   sources = [
-    "bookmark_constants.cc",
-    "bookmark_constants.h",
-    "bookmark_pref_names.cc",
-    "bookmark_pref_names.h",
+    "prefetch_common.cc",
+    "prefetch_common.h",
+    "prefetch_message_generator.cc",
+    "prefetch_message_generator.h",
+    "prefetch_messages.cc",
+    "prefetch_messages.h",
   ]
 
   deps = [
     "//base",
   ]
-  if (is_android) {
-    deps += [
-      "//components/bookmarks/common/android",
-    ]
-  }
 }