MD Settings: Hook up about_page to new LifetimeBrowserProxy.

chrome/browser/resources/settings/about_page/about_page.js

Index: chrome/browser/resources/settings/about_page/about_page.js
diff --git a/chrome/browser/resources/settings/about_page/about_page.js b/chrome/browser/resources/settings/about_page/about_page.js
index 59e1633a38d6b257c2b85ba756f17bdf1a64f628..62ea8ac67f3e81560541c12092fed6597aab8235 100644
--- a/chrome/browser/resources/settings/about_page/about_page.js
+++ b/chrome/browser/resources/settings/about_page/about_page.js
@@ -52,6 +52,9 @@ Polymer({
   /** @private {?settings.AboutPageBrowserProxy} */
   browserProxy_: null,
 
+  /** @private {?settings.LifetimeBrowserProxy} */
+  lifetimeBrowserProxy_: null,
+
   /**
    * @type {string} Selector to get the sections.
    * TODO(michaelpg): replace duplicate docs with @override once b/24294625
@@ -64,6 +67,9 @@ Polymer({
     this.browserProxy_ = settings.AboutPageBrowserProxyImpl.getInstance();
     this.browserProxy_.pageReady();
 
+    this.lifetimeBrowserProxy_ =
+        settings.LifetimeBrowserProxyImpl.getInstance();
+
 <if expr="chromeos">
     this.addEventListener('target-channel-changed', function(e) {
       this.targetChannel_ = e.detail;
@@ -117,7 +123,7 @@ Polymer({
 
   /** @private */
   onRelaunchTap_: function() {
-    this.browserProxy_.relaunchNow();
+    this.lifetimeBrowserProxy_.relaunch();
   },
 
   /**
@@ -253,7 +259,7 @@ Polymer({
 
   /** @private */
   onRelaunchAndPowerwashTap_: function() {
-    // TODO(dpapad): Implement this.
+    this.lifetimeBrowserProxy_.factoryReset();
   },
 
   /**