Remove OnOptInChanged callback.

chrome/browser/chromeos/extensions/gfx_utils.cc

Index: chrome/browser/chromeos/extensions/gfx_utils.cc
diff --git a/chrome/browser/chromeos/extensions/gfx_utils.cc b/chrome/browser/chromeos/extensions/gfx_utils.cc
index d723dfadae7a8e6573eb57f35ce6b0d448ef64a8..a985b5c4e2e2b647bee476ddc5e5e86fdf7b0ba2 100644
--- a/chrome/browser/chromeos/extensions/gfx_utils.cc
+++ b/chrome/browser/chromeos/extensions/gfx_utils.cc
@@ -194,13 +194,6 @@ void MaybeApplyChromeBadge(content::BrowserContext* context,
     return;
   }
 
-  arc::ArcAuthService* arc_auth_service = arc::ArcAuthService::Get();

[hidehiko, 2016/11/03 22:54:15]

Note: conceptually HasEquivalentInstalledArcApp should include this check, so we
do not need this.

-  // Only apply Chrome badge when ARC service is enabled.
-  if (!arc_auth_service ||

[khmel, 2016/11/03 23:09:17]

nit: you might no need #include "chrome/browser/chromeos/arc/arc_auth_service.h"

and probably

#include "chrome/browser/chromeos/arc/arc_support_host.h"

[hidehiko, 2016/11/04 00:04:56]

Done.

-      arc_auth_service->state() != arc::ArcAuthService::State::ACTIVE) {
-    return;
-  }
-
   const ExtensionRegistry* registry = ExtensionRegistry::Get(context);
   if (!registry || !registry->GetInstalledExtension(extension_id))
     return;