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

chrome/browser/ui/webui/ntp/ntp_resource_cache.cc

Index: chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
diff --git a/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc b/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
index 8bdee4bacc8596bbfa098a0424df57770e4169c4..51ca79ad854a43961d7abf9696b4fb0f6ad7f6bd 100644
--- a/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
+++ b/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
@@ -181,6 +181,7 @@ NTPResourceCache::NTPResourceCache(Profile* profile)
   pref_change_registrar_.Add(prefs::kShowBookmarkBar, callback);
   pref_change_registrar_.Add(prefs::kNtpShownPage, callback);
   pref_change_registrar_.Add(prefs::kSyncPromoShowNTPBubble, callback);
+  pref_change_registrar_.Add(prefs::kHideWebStoreIcon, callback);
 }
 
 NTPResourceCache::~NTPResourceCache() {}
@@ -406,6 +407,8 @@ void NTPResourceCache::CreateNewTabHTML() {
   load_time_data.SetBoolean("isSwipeTrackingFromScrollEventsEnabled",
                             is_swipe_tracking_from_scroll_events_enabled_);
   load_time_data.SetBoolean("showApps", should_show_apps_page_);
+  load_time_data.SetBoolean("isWebStoreIconHidden",

[Evan Stade, 2013/02/13 22:40:08]

make this one's name match the above pref, i.e.  showWebStoreIcon

[dconnelly, 2013/02/14 10:26:58]

Done.

+      prefs->GetBoolean(prefs::kHideWebStoreIcon));
 
 #if defined(OS_CHROMEOS)
   load_time_data.SetString("expandMenu",