Convert the utility process JSON parser into a Mojo service.

components/safe_json/BUILD.gn

Index: components/safe_json/BUILD.gn
diff --git a/components/safe_json/BUILD.gn b/components/safe_json/BUILD.gn
index 0f4ce37cafa032285e4c5e1c0f33f5a95d2ee471..33c65a0ab60ede8d8dec81145bf60cc79a110fd3 100644
--- a/components/safe_json/BUILD.gn
+++ b/components/safe_json/BUILD.gn
@@ -23,11 +23,11 @@ source_set("safe_json") {
   ]
 
   deps = [
-    ":messages",
     "//base",
+    "//components/safe_json/public/interfaces",
     "//components/strings",
     "//content/public/browser",
-    "//ipc",
+    "//content/public/common",
     "//ui/base",
   ]
 
@@ -39,9 +39,8 @@ source_set("safe_json") {
     ]
     deps += [ "android:safe_json_jni_headers" ]
     deps -= [
-      ":messages",
+      "//components/safe_json/public/interfaces",
       "//content/public/browser",
-      "//ipc",
     ]
   }
 }
@@ -74,34 +73,3 @@ source_set("test_support") {
     "//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",
-  ]
-
-  deps = [
-    ":messages",
-    "//base",
-    "//content/public/common",
-    "//content/public/utility",
-    "//ipc",
-  ]
-}