[iOS] //rlz:rlz_id should not be build on iOS.

rlz/BUILD.gn

 # Copyright 2014 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.
 
 # Note that this build file assumes rlz_use_chrome_net which is a condition in
 # the GYP file, but is always true for Chrome builds.
 
 import("//testing/test.gni")
 
 config("rlz_config") {
@@ skipping 102 matching lines @@
     ":rlz_lib",
     ":test_support",
     "//base",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/zlib",
   ]
 }
 
-executable("rlz_id") {
-  sources = [
-    "examples/rlz_id.cc",
-  ]
-  deps = [
-    ":rlz_lib",
-    "//build/config/sanitizers:deps",
-  ]
+if (!is_ios) {
+  executable("rlz_id") {
+    sources = [
+      "examples/rlz_id.cc",
+    ]
+    deps = [
+      ":rlz_lib",
+      "//build/config/sanitizers:deps",
+    ]
+  }
 }
 
 if (is_win) {
   shared_library("rlz") {
     sources = [
       "win/dll/dll_main.cc",
       "win/dll/exports.cc",
     ]
     deps = [
       ":rlz_lib",
       "//build/config/sanitizers:deps",
       "//third_party/zlib",
     ]
   }
 }