Correct Cursor.deepEquivalent

This getter returns an instance of Cursor, but it should return an instance of
either Cursor or WrappingCursor.

R=akihiroota@chromium.org

of a page that has a text field at the end.

Bug: none
Change-Id: Id52523c4b391d175303130c3f5494a1bf63c2f13
AX-Relnotes: ChromeVox will now wrap correctly when moving forward from the end
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450209Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813915}

chrome/browser/resources/chromeos/accessibility/chromevox/background/background_test.js

@@ -3105,3 +3105,18 @@ TEST_F('ChromeVoxBackgroundTest', 'VolumeChanges', function() {
         .replay();
   });
 });
+
+TEST_F('ChromeVoxBackgroundTest', 'WrapTextFieldAtEndOfDoc', function() {
+  const mockFeedback = this.createMockFeedback();
+  const site = `<p>start</p><div role="textbox" contenteditable></div>`;
+  this.runWithLoadedTree(site, function() {
+    mockFeedback.call(doCmd('nextObject'))
+        .expectSpeech('Edit text')
+        .call(doCmd('nextObject'))
+        .expectEarcon(Earcon.WRAP)
+        .expectSpeech('Web Content')
+        .call(doCmd('nextObject'))
+        .expectSpeech('start')
+        .replay();
+  });
+});

chrome/browser/resources/chromeos/accessibility/chromevox/background/cursors.js

@@ -564,7 +564,7 @@ cursors.Cursor = class {
       newIndex = cursors.NODE_INDEX;
     }
 
-    return new cursors.Cursor(newNode, newIndex);
+    return new this.constructor(newNode, newIndex);
   }
 
   /**