[Switch Access] Removed duplicate variable

Removed duplicate variable menuOriginNode
that likely appeared after a merge.

Bug: 982004
Change-Id: I857049cda8387b9e5d40189d1ed9afec49156e63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1773213Reviewed-by: Anastasia Helfinstein <anastasi@google.com>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Commit-Queue: Sophie Yang <sophyang@google.com>
Cr-Commit-Position: refs/heads/master@{#690936}

chrome/browser/resources/chromeos/switch_access/menu_manager.js

@@ -50,17 +50,12 @@ class MenuManager {
     this.node_;
 
     /**
-     * The node that the menu has been opened for.
+     * The node that the menu has been opened for. Null if the menu is not
+     * currently open.
      * @private {chrome.automation.AutomationNode}
      */
     this.menuOriginNode_;
 
-    /**
-     * The node that the menu has been opened for.
-     * @private {!chrome.automation.AutomationNode}
-     */
-    this.menuOriginNode_ = desktop;
-
     /**
      * Keeps track of when we're in the Switch Access menu.
      * @private {boolean}
@@ -152,6 +147,8 @@ class MenuManager {
           chrome.automation.EventType.TEXT_SELECTION_CHANGED,
           this.onSelectionChanged_.bind(this), false /** Don't use capture. */);
     }
+    this.menuOriginNode_ = null;
+
     chrome.accessibilityPrivate.setSwitchAccessMenuState(
         false /** Hide the menu. */, SAConstants.EMPTY_LOCATION, 0);
   }