Explicitly pull-in js/assert.js in weblayer/ and android_webview/

This is in preparation of removing <include src="assert.js"> and
flattenhtml="true" from js/util.js and js/cr/ui/array_data_model.js,
which in turn is necessary to auto-generate grd entries for
ui/webui/resources/js/cr/ui/.

Bug: 1143194
Change-Id: I9d69b9597ee228aacdc186e2e158d8ebea25558c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508355
Commit-Queue: Richard Coles <torne@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822654}

android_webview/ui/grit_resources_allowlist.txt

@@ -9,6 +9,7 @@ IDR_SAFE_BROWSING_CSS
 IDR_SAFE_BROWSING_JS
 IDR_SAFE_BROWSING_HTML
 IDR_WEBUI_JS_CR_JS
+IDR_WEBUI_JS_ASSERT_JS
 IDR_WEBUI_JS_UTIL_JS
 IDR_WEBUI_JS_PROMISE_RESOLVER_JS
 IDR_MOJO_MOJO_BINDINGS_LITE_JS

weblayer/browser/resources/weblayer_internals/weblayer_internals.html

@@ -6,6 +6,7 @@
     <link rel="stylesheet" href="chrome://resources/css/text_defaults.css">
 
     <script src="chrome://resources/js/cr.js"></script>
+    <script src="chrome://resources/js/assert.js"></script>
     <script src="chrome://resources/js/promise_resolver.js"></script>
     <script src="chrome://resources/js/util.js"></script>
     <script src="chrome://resources/mojo/mojo/public/js/mojo_bindings_lite.js"></script>