Partial revert: Fixes performance of Google Calendar + ChromeVox/automation

This is a small partial revert of
https://chromium-review.googlesource.com/c/chromium/src/+/1947643

The check in desktop_automation_handler.js -> range_automation_handler.js onEventIfInRange helped prevent processing of repeated attribute changes that come from the subtree of ChromeVox's current range.

For example, Gmail's threadlist where focus is on a row. Any attribute changes within cells or on individual cells caused output.

TBR=dmazzoni@chromium.org

Change-Id: I696cd506a2c8d33bfa343d36df76f7551c79bb56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1951085Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721587}

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

@@ -83,6 +83,9 @@ RangeAutomationHandler.prototype = {
       return;
     }
 
+    // TODO: we need more fine grained filters for attribute changes.
+    if (prev.contentEquals(cursors.Range.fromNode(evt.target)) ||
+        evt.target.state.focused) {
       var prevTarget = this.lastAttributeTarget_;
 
       // Re-target to active descendant if it exists.
@@ -112,6 +115,7 @@ RangeAutomationHandler.prototype = {
       }
 
       this.lastAttributeOutput_.go();
+    }
   },
 
   /**