Port live region ChromeVox tests.

chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js

Index: chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js
diff --git a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js b/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js
index c8a8a1792df8b67c6e0be4e8edf1c11440409154..11e469898db788c9bfc4a79729d94eac2a1f7214 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox/injected/live_regions.js
@@ -344,16 +344,18 @@ cvox.LiveRegions.announceChange = function(
   }
 
   var navDescriptions = cvox.LiveRegions.getNavDescriptionsRecursive(node);
-  if (navDescriptions.length == 0) {
-    return;
-  }
-
   if (isRemoval) {
+    navDescriptions = [cvox.DescriptionUtil.getDescriptionFromAncestors(
+        [node], true, cvox.ChromeVox.verbosity)];
     navDescriptions = [new cvox.NavDescription({
       context: cvox.ChromeVox.msgs.getMsg('live_regions_removed'), text: ''
     })].concat(navDescriptions);
   }
 
+  if (navDescriptions.length == 0) {
+    return;
+  }
+
   // Don't announce alerts on page load if their text and values consist of
   // just whitespace.
   var deltaTime = new Date() - cvox.LiveRegions.pageLoadTime;