favor DCHECK_CURRENTLY_ON for better logs in chromecast/

chromecast/browser/cast_http_user_agent_settings.cc

Index: chromecast/browser/cast_http_user_agent_settings.cc
diff --git a/chromecast/browser/cast_http_user_agent_settings.cc b/chromecast/browser/cast_http_user_agent_settings.cc
index c8bffe52178af5b2a8e990424dbe3b1f395080cc..ef752dc328710c7a22f2aa7a579fcc63b484e809 100644
--- a/chromecast/browser/cast_http_user_agent_settings.cc
+++ b/chromecast/browser/cast_http_user_agent_settings.cc
@@ -20,11 +20,11 @@ namespace chromecast {
 namespace shell {
 
 CastHttpUserAgentSettings::CastHttpUserAgentSettings() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 }
 
 CastHttpUserAgentSettings::~CastHttpUserAgentSettings() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 }
 
 std::string CastHttpUserAgentSettings::GetAcceptLanguage() const {