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"
 #include "base/file_util.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/string16.h"
 #include "base/string_number_conversions.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/extensions/app_launcher.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/policy/browser_policy_connector.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/browser/ui/bookmarks/bookmark_bar_constants.h"
@@ skipping 156 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 = !extensions::IsAppLauncherEnabled();
+  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 167 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));
   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_);
 
 #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);
 
   web_ui_util::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);
 }