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

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

 // 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.
 
 #include "chrome/browser/ui/webui/ntp/ntp_resource_cache.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 163 matching lines @@
 
   base::Closure callback = base::Bind(&NTPResourceCache::OnPreferenceChanged,
                                       base::Unretained(this));
 
   // Watch for pref changes that cause us to need to invalidate the HTML cache.
   pref_change_registrar_.Init(profile_->GetPrefs());
   pref_change_registrar_.Add(prefs::kSyncAcknowledgedSyncTypes, callback);
   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() {}
 
 bool NTPResourceCache::NewTabCacheNeedsRefresh() {
 #if defined(OS_MACOSX)
   // Invalidate if the current value is different from the cached value.
   bool is_enabled = platform_util::IsSwipeTrackingFromScrollEventsEnabled();
   if (is_enabled != is_swipe_tracking_from_scroll_events_enabled_) {
     is_swipe_tracking_from_scroll_events_enabled_ = is_enabled;
@@ skipping 205 matching lines @@
   load_time_data.SetString("page_switcher_change_title",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_PAGE_SWITCHER_CHANGE_TITLE));
   load_time_data.SetString("page_switcher_same_title",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_PAGE_SWITCHER_SAME_TITLE));
   // On Mac OS X 10.7+, horizontal scrolling can be treated as a back or
   // forward gesture. Pass through a flag that indicates whether or not that
   // feature is enabled.
   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",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_CLOSE_MENU_EXPAND));
 #endif
 
   NewTabPageHandler::GetLocalizedValues(profile_, &load_time_data);
   NTPLoginHandler::GetLocalizedValues(profile_, &load_time_data);
 
   webui::SetFontAndTextDirection(&load_time_data);
@@ skipping 167 matching lines @@
   static const base::StringPiece new_tab_theme_css(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
           chrome::search::IsInstantExtendedAPIEnabled(profile_) ?
           IDR_NEW_TAB_SEARCH_THEME_CSS : IDR_NEW_TAB_4_THEME_CSS));
 
   // Create the string from our template and the replacements.
   std::string css_string;
   css_string = ReplaceStringPlaceholders(new_tab_theme_css, subst, NULL);
   new_tab_css_ = base::RefCountedString::TakeString(&css_string);
 }