favor DCHECK_CURRENTLY_ON for better logs in chrome/browser/media_galleries , metrics and nacl_host

chrome/browser/nacl_host/nacl_browser_delegate_impl.cc

Index: chrome/browser/nacl_host/nacl_browser_delegate_impl.cc
diff --git a/chrome/browser/nacl_host/nacl_browser_delegate_impl.cc b/chrome/browser/nacl_host/nacl_browser_delegate_impl.cc
index 56ddb9dba88efd92f8c7981ed12586dc9e9499ac..1ed15da13329cec4f73f14eebf217c59a400ea04 100644
--- a/chrome/browser/nacl_host/nacl_browser_delegate_impl.cc
+++ b/chrome/browser/nacl_host/nacl_browser_delegate_impl.cc
@@ -59,7 +59,7 @@ const char* const kAllowedNonSfiOrigins[] = {
 void OnKeepaliveOnUIThread(
     const content::BrowserPpapiHost::OnKeepaliveInstanceData& instance_data,
     const base::FilePath& profile_data_directory) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   // Only one instance will exist for NaCl embeds, even when more than one
   // embed of the same plugin exists on the same page.