Changes to default apps promo per ui leads:

chrome/browser/extensions/default_apps.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_H_
 #define CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_H_
 #pragma once
 
 #include <set>
 #include <string>
 #include "chrome/common/extensions/extension.h"
 #include "base/gtest_prod_util.h"
 
 class PrefService;
 
 // Encapsulates business logic for:
 // - Whether to install default apps on Chrome startup
 // - Whether to show the app launcher
 // - Whether to show the apps promo in the launcher
 class DefaultApps {
  public:
-  // The maximum number of times to show the apps promo.
+  // The maximum number of times to show the apps promo. The promo counter
+  // actually goes up to this number + 1 because we need to differentiate
+  // between the first time we overflow and subsequent times.
   static const int kAppsPromoCounterMax;
 
   // Register our preferences.
   static void RegisterUserPrefs(PrefService* prefs);
 
   explicit DefaultApps(PrefService* prefs,
                        const std::string& application_locale);
   ~DefaultApps();
 
   // Gets the set of default apps.
   const ExtensionIdSet& default_apps() const;
 
   // Returns true if the default apps should be installed.
   bool ShouldInstallDefaultApps(const ExtensionIdSet& installed_ids);
 
   // Returns true if the app launcher in the NTP should be shown.
   bool ShouldShowAppLauncher(const ExtensionIdSet& installed_ids);
 
   // Returns true if the apps promo should be displayed in the launcher.
   //
   // NOTE: If the default apps have been installed, but |installed_ids| is
   // different than GetDefaultApps(), this will permanently expire the promo.
-  bool ShouldShowPromo(const ExtensionIdSet& installed_ids);
+  bool ShouldShowPromo(const ExtensionIdSet& installed_ids, bool* just_expired);
 
   // Should be called after each app is installed. Once installed_ids contains
   // all the default apps, GetAppsToInstall() will start returning NULL.
   void DidInstallApp(const ExtensionIdSet& installed_ids);
 
-  // Should be called after each time the promo is installed.
-  void DidShowPromo();
-
   // Force the promo to be hidden.
   void SetPromoHidden();
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ExtensionDefaultApps, HappyPath);
   FRIEND_TEST_ALL_PREFIXES(ExtensionDefaultApps, UnsupportedLocale);
   FRIEND_TEST_ALL_PREFIXES(ExtensionDefaultApps, HidePromo);
   FRIEND_TEST_ALL_PREFIXES(ExtensionDefaultApps, InstallingAnAppHidesPromo);
   FRIEND_TEST_ALL_PREFIXES(ExtensionDefaultApps,
                            ManualAppInstalledWhileInstallingDefaultApps);
@@ skipping 16 matching lines @@
   std::string application_locale_;
 
   // The set of default extensions. Initialized to a static list in the
   // constructor.
   ExtensionIdSet ids_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultApps);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_DEFAULT_APPS_H_