Split out non-auto-generatable externs from auto generated ones.

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_object_constructor_installer.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_object_constructor_installer.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_object_constructor_installer.js
index cdb5e93ec187fee0a9f273fb3740da6a3672e90a..91bffac04d46af4f84d7375a25d492909849949f 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_object_constructor_installer.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_object_constructor_installer.js
@@ -11,6 +11,7 @@
  */
 
 goog.provide('AutomationObjectConstructorInstaller');
+goog.provide('ChromeVoxAutomationEvent');
 
 /**
  * Installs the AutomationNode and AutomationEvent classes based on an
@@ -24,8 +25,8 @@ AutomationObjectConstructorInstaller.init = function(node, callback) {
           node.constructor);
   node.addEventListener(chrome.automation.EventType.childrenChanged,
       function installAutomationEvent(e) {
-        chrome.automation.AutomationEvent =
-            /** @type {function (new:chrome.automation.AutomationEvent)} */(
+        window.ChromeVoxAutomationEvent =
+            /** @type {function (new:ChromeVoxAutomationEvent)} */(
                 e.constructor);
         node.removeEventListener(
             chrome.automation.EventType.childrenChanged,
@@ -35,3 +36,12 @@ AutomationObjectConstructorInstaller.init = function(node, callback) {
       },
       true);
 };
+
+/**
+ * @param {chrome.automation.EventType} eventType
+ * @param {chrome.automation.AutomationNode} node
+ * @param {string} eventFrom
+ * @constructor
+ */
+ChromeVoxAutomationEvent = function(eventType, node, eventFrom) {
+};