Don't show the apps page on the NTP if the app launcher is installed.

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 174 matching lines @@
 
 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;
     return true;
   }
 #endif
+  bool should_show_apps_page = profile_->GetPrefs()->GetBoolean(
+      prefs::kNtpShouldShowAppsPage);
+  if (should_show_apps_page != should_show_apps_page_) {
+    should_show_apps_page_ = should_show_apps_page;
+    return true;
+  }
   return false;
 }
 
 base::RefCountedMemory* NTPResourceCache::GetNewTabHTML(bool is_incognito) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (is_incognito) {
     if (!new_tab_incognito_html_.get())
       CreateNewTabIncognitoHTML();
   } else {
     // Refresh the cached HTML if necessary.
@@ skipping 100 matching lines @@
 
 void NTPResourceCache::CreateNewTabHTML() {
   // TODO(estade): these strings should be defined in their relevant handlers
   // (in GetLocalizedValues) and should have more legible names.
   // Show the profile name in the title and most visited labels if the current
   // profile is not the default.
   PrefService* prefs = profile_->GetPrefs();
   DictionaryValue load_time_data;
   load_time_data.SetBoolean("bookmarkbarattached",
       prefs->GetBoolean(prefs::kShowBookmarkBar));
+  load_time_data.SetBoolean("showApps",
+      prefs->GetBoolean(prefs::kNtpShouldShowAppsPage));
   load_time_data.SetBoolean("hasattribution",
       ThemeServiceFactory::GetForProfile(profile_)->HasCustomImage(
           IDR_THEME_NTP_ATTRIBUTION));
   load_time_data.SetString("title",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_TITLE));
   load_time_data.SetString("mostvisited",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_MOST_VISITED));
   load_time_data.SetString("suggestions",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_SUGGESTIONS));
   load_time_data.SetString("restoreThumbnailsShort",
@@ skipping 47 matching lines @@
   load_time_data.SetString("otherSessionsLearnMoreUrl",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_OTHER_SESSIONS_LEARN_MORE_URL));
   load_time_data.SetString("learnMore",
       l10n_util::GetStringUTF16(IDS_LEARN_MORE));
   load_time_data.SetString("webStoreLink",
       GetUrlWithLang(GURL(extension_urls::GetWebstoreLaunchURL())));
   load_time_data.SetString("appInstallHintText",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_APP_INSTALL_HINT_LABEL));
   load_time_data.SetBoolean("isDiscoveryInNTPEnabled",
       NewTabUI::IsDiscoveryInNTPEnabled());
-  load_time_data.SetBoolean("showApps", NewTabUI::ShouldShowApps());
   load_time_data.SetString("collapseSessionMenuItemText",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_OTHER_SESSIONS_COLLAPSE_SESSION));
   load_time_data.SetString("expandSessionMenuItemText",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_OTHER_SESSIONS_EXPAND_SESSION));
   load_time_data.SetString("restoreSessionMenuItemText",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_OTHER_SESSIONS_OPEN_ALL));
   load_time_data.SetString("learn_more",
       l10n_util::GetStringUTF16(IDS_LEARN_MORE));
   load_time_data.SetString("tile_grid_screenreader_accessible_description",
       l10n_util::GetStringUTF16(IDS_NEW_TAB_TILE_GRID_ACCESSIBLE_DESCRIPTION));
@@ skipping 186 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);
 }