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

chrome/browser/ui/app_list/apps_model_builder.cc

Index: chrome/browser/ui/app_list/apps_model_builder.cc
diff --git a/chrome/browser/ui/app_list/apps_model_builder.cc b/chrome/browser/ui/app_list/apps_model_builder.cc
index 4bacc0a56eb637382f3489a835243896899052a5..904787a7fab414bd0882bcc36fdbe03000a058a6 100644
--- a/chrome/browser/ui/app_list/apps_model_builder.cc
+++ b/chrome/browser/ui/app_list/apps_model_builder.cc
@@ -11,6 +11,8 @@
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/extensions/install_tracker.h"
+#include "chrome/browser/extensions/install_tracker_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/app_list/extension_app_item.h"
 #include "chrome/common/chrome_notification_types.h"
@@ -43,6 +45,9 @@ AppsModelBuilder::AppsModelBuilder(Profile* profile,
       controller_(controller),
       model_(model),
       ignore_changes_(false) {
+  extensions::InstallTracker* tracker =
+      extensions::InstallTrackerFactory::GetForProfile(profile_);
+  tracker->AddObserver(this);
   extensions::ExtensionPrefs* extension_prefs =
       extensions::ExtensionSystem::Get(profile_)->extension_service()->
           extension_prefs();
@@ -65,6 +70,9 @@ AppsModelBuilder::AppsModelBuilder(Profile* profile,
 }
 
 AppsModelBuilder::~AppsModelBuilder() {
+  extensions::InstallTracker* tracker =
+      extensions::InstallTrackerFactory::GetForProfile(profile_);
+  tracker->RemoveObserver(this);
   model_->RemoveObserver(this);
 }
 
@@ -78,7 +86,10 @@ void AppsModelBuilder::Build() {
 void AppsModelBuilder::OnBeginExtensionInstall(
     const std::string& extension_id,
     const std::string& extension_name,
-    const gfx::ImageSkia& installing_icon) {
+    const gfx::ImageSkia& installing_icon,
+    bool is_app) {
+  if (!is_app)
+    return;
   InsertApp(new ExtensionAppItem(profile_,
                                  extension_id,
                                  controller_,