Change NotifyAppList*() functions into observers on a ProfileKeyedService.

chrome/common/chrome_notification_types.h

Index: chrome/common/chrome_notification_types.h
diff --git a/chrome/common/chrome_notification_types.h b/chrome/common/chrome_notification_types.h
index 1c8d340309b763bd414b87b6685ec9273e4baf30..d60b1ebeafa636291cb3d0f74405527b544782c7 100644
--- a/chrome/common/chrome_notification_types.h
+++ b/chrome/common/chrome_notification_types.h
@@ -1146,6 +1146,17 @@ enum NotificationType {
   // and Details is the string ID of the extension.
   NOTIFICATION_APP_INSTALLED_TO_APPLIST,
 
+  // Sent when an extension begins installing. The details are an
+  // ExtensionInstallingDetails, and the source is a Profile.
+  NOTIFICATION_EXTENSION_INSTALL_BEGIN,
+
+  // Sent when an extension fails to install. The details are an extension id.
+  NOTIFICATION_EXTENSION_INSTALL_FAIL,
+
+  // Sent when an extension installation makes progress. The details are a
+  // std::pair<std::string, int> - the extension id and the percent complete.
+  NOTIFICATION_EXTENSION_INSTALL_PROGRESS,
+
 #if defined(USE_ASH)
   // Sent when wallpaper show animation has finished.
   NOTIFICATION_WALLPAPER_ANIMATION_FINISHED,