Delete dead AppsPromo code

chrome/common/extensions/extension_constants.h

 // 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #pragma once
 
 #include <string>
 
@@ skipping 117 matching lines @@
   // histograms and preferences.
   enum LaunchContainer {
     LAUNCH_WINDOW,
     LAUNCH_PANEL,
     LAUNCH_TAB,
     // For platform apps, which don't actually have a container (they just get a
     // "onLaunched" event).
     LAUNCH_NONE
   };
 
-  // The name of the apps promo histogram.
-  extern const char kAppsPromoHistogram[];
-
-  // The buckets used in the apps promo histogram.
-  enum AppsPromoBuckets {
-    PROMO_LAUNCH_APP,
-    PROMO_LAUNCH_WEB_STORE,
-    PROMO_CLOSE,
-    PROMO_EXPIRE,
-    PROMO_SEEN,
-    PROMO_BUCKET_BOUNDARY
-  };
-
   // The name of the app launch histogram.
   extern const char kAppLaunchHistogram[];
 
   // The buckets used for app launches.
   enum AppLaunchBucket {
     // Launch from NTP apps section while maximized.
     APP_LAUNCH_NTP_APPS_MAXIMIZED,
 
     // Launch from NTP apps section while collapsed.
     APP_LAUNCH_NTP_APPS_COLLAPSED,
@@ skipping 91 matching lines @@
   extern const char kAppStateRunning[];
   extern const char kAppStateCannotRun[];
   extern const char kAppStateReadyToRun[];
 
   // Error indicating that the app notifications API is not accessible by split
   // mode extensions in incognito windows.
   extern const char kAppNotificationsIncognitoError[];
 }  // extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_