Revert of Allow users to add third-party VPNs from the settings page

chrome/browser/resources/options/chromeos/vpn_providers.js

Index: chrome/browser/resources/options/chromeos/vpn_providers.js
diff --git a/chrome/browser/resources/options/chromeos/vpn_providers.js b/chrome/browser/resources/options/chromeos/vpn_providers.js
index 661a62c126196ecc063b6fafb2de4682c8e451b0..911c68487fbf67238d92644ad4eb93e2329bdd87 100644
--- a/chrome/browser/resources/options/chromeos/vpn_providers.js
+++ b/chrome/browser/resources/options/chromeos/vpn_providers.js
@@ -26,33 +26,6 @@
     providers_: [],
 
     /**
-     * Observers who will be notified when the list of VPN providers changes.
-     * @type {!Array<!function()>}
-     */
-    observers_: [],
-
-    /**
-     * The VPN providers enabled in the primary user's profile.
-     * @type {!Array<{name: string, extensionID: ?string}>}
-     */
-    get providers() {
-      return this.providers_;
-    },
-    set providers(providers) {
-      this.providers_ = providers;
-      for (var i = 0; i < this.observers_.length; ++i)
-        this.observers_[i]();
-    },
-
-    /**
-     * Adds an observer to be notified when the list of VPN providers changes.
-     * @param {!function()} observer The observer to add.
-     */
-    addObserver: function(observer) {
-      this.observers_.push(observer);
-    },
-
-    /**
      * Formats a network name for display purposes. If the network belongs to
      * a third-party VPN provider, the provider name is added to the network
      * name.
@@ -77,20 +50,12 @@
   };
 
   /**
-   * Adds an observer to be notified when the list of VPN providers changes.
-   * @param {!function()} observer The observer to add.
-   */
-  VPNProviders.addObserver = function(observer) {
-    VPNProviders.getInstance().addObserver(observer);
-  };
-
-  /**
    * Returns the list of VPN providers enabled in the primary user's profile.
    * @return {!Array<{name: string, extensionID: ?string}>} The list of VPN
    *     providers enabled in the primary user's profile.
    */
   VPNProviders.getProviders = function() {
-    return VPNProviders.getInstance().providers;
+    return VPNProviders.getInstance().providers_;
   };
 
   /**
@@ -99,7 +64,7 @@
    *     of VPN providers enabled in the primary user's profile.
    */
   VPNProviders.setProviders = function(providers) {
-    VPNProviders.getInstance().providers = providers;
+    VPNProviders.getInstance().providers_ = providers;
   };
 
   /**