Revert of Update json_schema_compiler to handle the Automation extension API

chrome/browser/resources/chromeos/chromevox/cvox2/background/live_regions.js

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/live_regions.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/live_regions.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/live_regions.js
index db1c1323fa4817b6bc15db0b72273cb75ac14eda..7c0eb03eb6a4938f2f48b0cd88ffdfa7645bd46b 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/live_regions.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/live_regions.js
@@ -14,7 +14,6 @@
 var AutomationNode = chrome.automation.AutomationNode;
 var RoleType = chrome.automation.RoleType;
 var TreeChange = chrome.automation.TreeChange;
-var TreeChangeObserverFilter = chrome.automation.TreeChangeObserverFilter;
 
 /**
  * ChromeVox2 live region handler.
@@ -44,8 +43,7 @@
    */
   this.liveRegionNodeSet_ = new WeakSet();
   chrome.automation.addTreeChangeObserver(
-      TreeChangeObserverFilter.LIVE_REGION_TREE_CHANGES,
-      this.onTreeChange.bind(this));
+      'liveRegionTreeChanges', this.onTreeChange.bind(this));
 };
 
 /**
@@ -93,7 +91,7 @@
     var webView = AutomationUtil.getTopLevelRoot(node);
     webView = webView ? webView.parent : null;
     if (!LiveRegions.announceLiveRegionsFromBackgroundTabs_ &&
-        currentRange.start.node.role != RoleType.DESKTOP &&
+        currentRange.start.node.role != RoleType.desktop &&
         (!webView || !webView.state.focused)) {
       return;
     }
@@ -137,7 +135,7 @@
     }
 
     // Alerts should be announced as a result of focus.
-    if (node.role == RoleType.ALERT)
+    if (node.role == RoleType.alert)
       return;
 
     var range = cursors.Range.fromNode(node);