Add a policy to hide the Web Store on new tabs.

chrome/browser/resources/ntp4/new_tab.js

 // Copyright (c) 2012 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.
 
 /**
  * @fileoverview New tab page
  * This is the main code for the new tab page used by touch-enabled Chrome
  * browsers.  For now this is still a prototype.
  */
 
@@ skipping 155 matching lines @@
                                    loadTimeData.getString('suggestions'),
                                    false,
                                    (newTabView.appsPages.length > 0) ?
                                        newTabView.appsPages[0] : null);
          chrome.send('getSuggestions');
          cr.dispatchSimpleEvent(document, 'sectionready', true, true);
       };
       document.querySelector('head').appendChild(suggestions_script);
     }
 
-    var webStoreLink = loadTimeData.getString('webStoreLink');
-    var url = appendParam(webStoreLink, 'utm_source', 'chrome-ntp-launcher');
-    $('chrome-web-store-link').href = url;
-    $('chrome-web-store-link').addEventListener('click',
-        onChromeWebStoreButtonClick);
+    if (!loadTimeData.getBoolean('showWebStoreIcon')) {
+      var webStoreIcon = $('chrome-web-store-link');
+      // Not all versions of the NTP have a footer, so this may not exist.
+      if (webStoreIcon)
+        webStoreIcon.classList.add('invisible');
+    } else {
+      var webStoreLink = loadTimeData.getString('webStoreLink');
+      var url = appendParam(webStoreLink, 'utm_source', 'chrome-ntp-launcher');
+      $('chrome-web-store-link').href = url;
+      $('chrome-web-store-link').addEventListener('click',
+          onChromeWebStoreButtonClick);
+    }
 
     if (loadTimeData.getString('login_status_message')) {
       loginBubble = new cr.ui.Bubble;
       loginBubble.anchorNode = $('login-container');
       loginBubble.arrowLocation = cr.ui.ArrowLocation.TOP_END;
       loginBubble.bubbleAlignment =
           cr.ui.BubbleAlignment.BUBBLE_EDGE_TO_ANCHOR_EDGE;
       loginBubble.deactivateToDismissDelay = 2000;
       loginBubble.closeButtonVisible = false;
 
@@ skipping 472 matching lines @@
     setFaviconDominantColor: setFaviconDominantColor,
     showNotification: showNotification,
     themeChanged: themeChanged,
     updateLogin: updateLogin
   };
 });
 
 document.addEventListener('DOMContentLoaded', ntp.onLoad);
 
 var toCssPx = cr.ui.toCssPx;