Use ExtensionRegistryObserver instead of deprecated extension notification from autocomplete

chrome/browser/autocomplete/shortcuts_backend.cc

Index: chrome/browser/autocomplete/shortcuts_backend.cc
diff --git a/chrome/browser/autocomplete/shortcuts_backend.cc b/chrome/browser/autocomplete/shortcuts_backend.cc
index 15e8bba32175e4fa43566fad634019562c269c9a..b8df7feb1852615959a5154d0c32b5f9d2aa9acf 100644
--- a/chrome/browser/autocomplete/shortcuts_backend.cc
+++ b/chrome/browser/autocomplete/shortcuts_backend.cc
@@ -28,6 +28,7 @@
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
+#include "extensions/browser/extension_registry.h"
 #include "extensions/common/extension.h"
 
 using content::BrowserThread;
@@ -73,6 +74,7 @@ AutocompleteMatch::Type GetTypeForShortcut(AutocompleteMatch::Type type) {
 ShortcutsBackend::ShortcutsBackend(Profile* profile, bool suppress_db)
     : profile_(profile),
       current_state_(NOT_INITIALIZED),
+      extension_registry_observer_(this),
       no_db_access_(suppress_db) {
   if (!suppress_db) {
     db_ = new history::ShortcutsDatabase(
@@ -81,11 +83,10 @@ ShortcutsBackend::ShortcutsBackend(Profile* profile, bool suppress_db)
   // |profile| can be NULL in tests.
   if (profile) {
     notification_registrar_.Add(
-        this, chrome::NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED,
-        content::Source<Profile>(profile));
-    notification_registrar_.Add(
         this, chrome::NOTIFICATION_HISTORY_URLS_DELETED,
         content::Source<Profile>(profile));
+    extension_registry_observer_.Add(
+        extensions::ExtensionRegistry::Get(profile));
   }
 }
 
@@ -167,17 +168,6 @@ void ShortcutsBackend::ShutdownOnUIThread() {
 void ShortcutsBackend::Observe(int type,
                                const content::NotificationSource& source,
                                const content::NotificationDetails& details) {
-  if (!initialized())
-    return;
-
-  if (type == chrome::NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED) {
-    // When an extension is unloaded, we want to remove any Shortcuts associated
-    // with it.
-    DeleteShortcutsWithURL(content::Details<extensions::UnloadedExtensionInfo>(
-        details)->extension->url(), false);
-    return;
-  }
-
   DCHECK_EQ(chrome::NOTIFICATION_HISTORY_URLS_DELETED, type);
   const history::URLsDeletedDetails* deleted_details =
       content::Details<const history::URLsDeletedDetails>(details).ptr();
@@ -198,6 +188,18 @@ void ShortcutsBackend::Observe(int type,
   DeleteShortcutsWithIDs(shortcut_ids);
 }
 
+void ShortcutsBackend::OnExtensionUnloaded(
+    content::BrowserContext* browser_context,
+    const extensions::Extension* extension,
+    extensions::UnloadedExtensionInfo::Reason reason) {
+  if (!initialized())
+    return;
+
+  // When an extension is unloaded, we want to remove any Shortcuts associated
+  // with it.
+  DeleteShortcutsWithURL(extension->url(), false);
+}
+
 void ShortcutsBackend::InitInternal() {
   DCHECK(current_state_ == INITIALIZING);
   db_->Init();