Link Blink into the browser process less.

components/safe_json/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 # GYP version: components/safe_json.gypi:safe_json
 source_set("safe_json") {
   sources = [
     "android/component_jni_registrar.cc",
     "android/component_jni_registrar.h",
     "json_sanitizer.cc",
     "json_sanitizer.h",
     "json_sanitizer_android.cc",
     "safe_json_parser.cc",
     "safe_json_parser.h",
     "safe_json_parser_android.cc",
     "safe_json_parser_android.h",
     "safe_json_parser_impl.cc",
     "safe_json_parser_impl.h",
   ]
 
   deps = [
-    ":safe_json_parser_message_filter",
+    ":messages",
     "//base",
     "//components/strings",
     "//content/public/browser",
     "//ipc",
     "//ui/base",
   ]
 
   if (is_android) {
     sources -= [
       "json_sanitizer.cc",
@@ skipping 26 matching lines @@
     "testing_json_parser.cc",
     "testing_json_parser.h",
   ]
 
   deps = [
     ":safe_json",
     "//base",
   ]
 }
 
+# This is a separate source set so that it can be shared between safe_json
+# (which can be used from any process) and the message filter (which depends on
+# the utility process and hence indirectly Blink.
+source_set("messages") {
+  sources = [
+    "safe_json_parser_messages.cc",
+    "safe_json_parser_messages.h",
+  ]
+
+  deps = [
+    "//content/public/common",
+    "//ipc",
+  ]
+}
+
 # GYP version: components/safe_json.gypi:safe_json_parser_message_filter
 source_set("safe_json_parser_message_filter") {
   sources = [
     "safe_json_parser_message_filter.cc",
     "safe_json_parser_message_filter.h",
-    "safe_json_parser_messages.cc",
-    "safe_json_parser_messages.h",
   ]
 
   deps = [
+    ":messages",
     "//base",
     "//content/public/common",
     "//content/public/utility",
     "//ipc",
   ]
 }