Fix losing selected language on ToS page reloading.

chrome/browser/resources/chromeos/arc_support/background.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * UI Pages. Note the order must be in sync with the ArcAuthService::UIPage
  * enum.
  * @type {Array<string>}
  */
 var UI_PAGES = ['none',
@@ skipping 318 matching lines @@
       this.termsView_.style.height = style.getPropertyValue('height');
     }.bind(this), 0);
   }
 
   /** Starts to load the terms of service webview content. */
   startTermsViewLoading_() {
     if (this.state_ == LoadState.LOADING) {
       // If there already is inflight loading task, do nothing.
       return;
     }
-    this.termsView_.src = 'https://play.google.com/about/play-terms.html';
+
+    if (this.termsView_.src) {
+      // This is reloading the page, typically clicked RETRY on error page.
+      this.termsView_.reload();
+    } else {
+      // This is first loading case so set the URL explicitly.
+      this.termsView_.src = 'https://play.google.com/about/play-terms.html';
+    }
   }
 
   /** Called when the terms-view starts to be loaded. */
   onTermsViewLoadStarted_() {
     // Note: Reloading can be triggered by user action. E.g., user may select
     // their language by selection at the bottom of the Terms Of Service
     // content.
     this.state_ = LoadState.LOADING;
     // Show loading page.
     this.loadingContainer_.hidden = false;
@@ skipping 438 matching lines @@
       type: 'chrome',
       color: '#ffffff'
     },
     'innerBounds': {
       'width': INNER_WIDTH,
       'height': INNER_HEIGHT
     }
   };
   chrome.app.window.create('main.html', options, onWindowCreated);
 });