[CCA] Convert util.js into ES6 module.

Bug: 141518780
Test: Pass closure compiler check, tast run <DUT> 'camera.CCAUI*' and
manually validate tooltips function of CCA works correctly.

Change-Id: Iaca4c5b8116f788228726b55ef82281b464e6016
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1981413
Commit-Queue: Kuo Jen Wei <inker@chromium.org>
Auto-Submit: Kuo Jen Wei <inker@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727395}

chrome/browser/resources/chromeos/camera/src/js/BUILD.gn

@@ -139,6 +139,7 @@ js_library("tooltip") {
 
 js_library("util") {
   deps = [
+    ":namespace",
     ":tooltip",
     ":type",
     "browser_proxy:browser_proxy",

chrome/browser/resources/chromeos/camera/src/js/namespace.js

@@ -11,4 +11,5 @@
 var cca = {
   mojo: {},
   tooltip: {},
+  util: {},
 };

chrome/browser/resources/chromeos/camera/src/views/main.html

@@ -17,7 +17,7 @@
     <script defer src="../js/perf.js"></script>
     <script defer src="../js/metrics.js"></script>
     <script defer src="../js/intent.js"></script>
-    <script defer src="../js/util.js"></script>
+    <script type="module" src="../js/util.js"></script>
     <script defer src="../js/toast.js"></script>
     <script type="module" src="../js/tooltip.js"></script>
     <script defer src="../js/state.js"></script>