Update mojo sdk to rev f84766d3b6420b7cf6a113d9d65d73cb5fe18d90

third_party/mojo/src/mojo/public/tools/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.
 
 import("//build/module_args/mojo.gni")
 import("../mojo.gni")
 
 if (mojo_use_prebuilt_mojo_shell) {
   copy("copy_mojo_shell") {
     filename = "mojo_shell"
@@ skipping 20 matching lines @@
 if (mojo_use_prebuilt_network_service) {
   copy("copy_network_service") {
     filename = "network_service.mojo"
     if (defined(mojo_prebuilt_network_service_location) &&
         mojo_prebuilt_network_service_location != "") {
       sources = [
         "$mojo_prebuilt_network_service_location",
       ]
     } else {
       if (is_android) {
-        assert(cpu_arch == "arm",
+        assert(current_cpu == "arm",
                "Only arm version prebuilt netowrk_service.mojo is available.")
         sources = [
           "prebuilt/network_service/android-arm/$filename",
         ]
       } else {
         assert(is_linux)
         sources = [
           "prebuilt/network_service/linux-x64/$filename",
         ]
       }
     }
 
     outputs = [
       "$root_out_dir/$filename",
     ]
   }
 
   copy("copy_network_service_apptests") {
     filename = "network_service_apptests.mojo"
     if (defined(mojo_prebuilt_network_service_apptests_location) &&
         mojo_prebuilt_network_service_apptests_location != "") {
       sources = [
         "$mojo_prebuilt_network_service_apptests_location",
       ]
     } else {
       if (is_android) {
         assert(
-            cpu_arch == "arm",
+            target_cpu == "arm",
             "Only arm version prebuilt netowrk_service_apptests.mojo is available.")
         sources = [
           "prebuilt/network_service_apptests/android-arm/$filename",
         ]
       } else {
         assert(is_linux)
         sources = [
           "prebuilt/network_service_apptests/linux-x64/$filename",
         ]
       }
@@ skipping 11 matching lines @@
 if (mojo_use_dart_apptest_framework) {
   copy("dart_apptest_framework") {
     sources = [
       "prebuilt/frameworks/apptest.dartzip",
     ]
     outputs = [
       "$target_out_dir/dart_apptest_framework.dartzip",
     ]
   }
 }