Bug 1553450 - Disable asrouter devtoolsEnabled in mochitest environment (#5055)

test/browser/browser.ini

@@ -8,7 +8,6 @@ prefs =
   browser.newtabpage.activity-stream.discoverystream.endpoints=data:
   browser.newtabpage.activity-stream.feeds.section.topstories=true
   browser.newtabpage.activity-stream.feeds.section.topstories.options={}
-  browser.newtabpage.activity-stream.asrouter.devtoolsEnabled=true
 
 [browser_activity_stream_strings.js]
 [browser_as_load_location.js]

test/browser/browser_asrouter_snippets.js

@@ -1,10 +1,11 @@
 "use strict";
 
 const {ASRouter} = ChromeUtils.import("resource://activity-stream/lib/ASRouter.jsm");
+const {SnippetsTestMessageProvider} = ChromeUtils.import("resource://activity-stream/lib/SnippetsTestMessageProvider.jsm");
 
 test_newtab({
   async before() {
-    let data = ASRouter.state.messages.find(m => m.id === "SIMPLE_BELOW_SEARCH_TEST_1");
+    let data = SnippetsTestMessageProvider.getMessages().find(m => m.id === "SIMPLE_BELOW_SEARCH_TEST_1");
     ASRouter.messageChannel.sendAsyncMessage("ASRouter:parent-to-child", {type: "SET_MESSAGE", data});
   },
   test: async function test_simple_below_search_snippet() {
@@ -21,7 +22,7 @@ test_newtab({
 
 test_newtab({
   async before() {
-    let data = ASRouter.state.messages.find(m => m.id === "SIMPLE_TEST_1");
+    let data = SnippetsTestMessageProvider.getMessages().find(m => m.id === "SIMPLE_TEST_1");
     ASRouter.messageChannel.sendAsyncMessage("ASRouter:parent-to-child", {type: "SET_MESSAGE", data});
   },
   test: async function test_simple_snippet() {