Change base::TickClock to a ref counted class.

extensions/browser/api/cast_channel/cast_channel_api.cc

Index: extensions/browser/api/cast_channel/cast_channel_api.cc
diff --git a/extensions/browser/api/cast_channel/cast_channel_api.cc b/extensions/browser/api/cast_channel/cast_channel_api.cc
index 9d711a48c0c7910804a435ce46cd76f4fa3ae8c6..907a036c69210d6306afeda46f1fb1f548e79071 100644
--- a/extensions/browser/api/cast_channel/cast_channel_api.cc
+++ b/extensions/browser/api/cast_channel/cast_channel_api.cc
@@ -108,7 +108,7 @@ bool IsValidConnectInfoIpAddress(const ConnectInfo& connect_info) {
 CastChannelAPI::CastChannelAPI(content::BrowserContext* context)
     : browser_context_(context),
       logger_(
-          new Logger(scoped_ptr<base::TickClock>(new base::DefaultTickClock),
+          new Logger(scoped_refptr<base::TickClock>(new base::DefaultTickClock),
                      base::TimeTicks::UnixEpoch())) {
   DCHECK(browser_context_);
 }