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

chrome/browser/resources/ntp4/new_tab.js

Index: chrome/browser/resources/ntp4/new_tab.js
diff --git a/chrome/browser/resources/ntp4/new_tab.js b/chrome/browser/resources/ntp4/new_tab.js
index 483446d59822bc3dd377f5a183dd760f29f29b67..34e71a4ced61ee51db1ba720202f24d3fd2e6324 100644
--- a/chrome/browser/resources/ntp4/new_tab.js
+++ b/chrome/browser/resources/ntp4/new_tab.js
@@ -162,11 +162,18 @@ cr.define('ntp', function() {
       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('isWebStoreIconHidden')) {
+      var webStoreIcon = $('chrome-web-store-link');
+      // The next NTP has no footer.
+      if (webStoreIcon)
+        webStoreIcon.parentNode.removeChild(webStoreIcon);
+    } 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;