Use base::ScopedTypeRef for CGL types

content/browser/renderer_host/display_link_mac.cc

Index: content/browser/renderer_host/display_link_mac.cc
diff --git a/content/browser/renderer_host/display_link_mac.cc b/content/browser/renderer_host/display_link_mac.cc
index b7239c0899bbb47d6a2e04516585a91dcf4a5a02..0a668c5d6dae79ddebe74f7af4a6dfd22cdfde61 100644
--- a/content/browser/renderer_host/display_link_mac.cc
+++ b/content/browser/renderer_host/display_link_mac.cc
@@ -13,17 +13,16 @@ namespace content {
 scoped_refptr<DisplayLinkMac> DisplayLinkMac::Create() {
   CVReturn ret = kCVReturnSuccess;
 
-  scoped_refptr<DisplayLinkMac> display_link_mac;
-  {
-    CVDisplayLinkRef display_link = NULL;
-    ret = CVDisplayLinkCreateWithActiveCGDisplays(&display_link);
-    if (ret != kCVReturnSuccess) {
-      LOG(ERROR) << "CVDisplayLinkCreateWithActiveCGDisplays failed: " << ret;
-      return NULL;
-    }
-    display_link_mac = new DisplayLinkMac(display_link);
+  ScopedCVDisplayLinkRef display_link;
+  ret = CVDisplayLinkCreateWithActiveCGDisplays(&display_link);
+  if (ret != kCVReturnSuccess) {
+    LOG(ERROR) << "CVDisplayLinkCreateWithActiveCGDisplays failed: " << ret;
+    return NULL;
   }
 
+  scoped_refptr<DisplayLinkMac> display_link_mac;
+  display_link_mac = new DisplayLinkMac(display_link);
+
   ret = CVDisplayLinkSetOutputCallback(
       display_link_mac->display_link_,
       &DisplayLinkCallback,
@@ -36,7 +35,7 @@ scoped_refptr<DisplayLinkMac> DisplayLinkMac::Create() {
   return display_link_mac;
 }
 
-DisplayLinkMac::DisplayLinkMac(CVDisplayLinkRef display_link)
+DisplayLinkMac::DisplayLinkMac(ScopedCVDisplayLinkRef display_link)
   : display_link_(display_link),
     stop_timer_(
         FROM_HERE, base::TimeDelta::FromSeconds(1),
@@ -47,7 +46,6 @@ DisplayLinkMac::DisplayLinkMac(CVDisplayLinkRef display_link)
 DisplayLinkMac::~DisplayLinkMac() {
   if (CVDisplayLinkIsRunning(display_link_))
     CVDisplayLinkStop(display_link_);
-  CVDisplayLinkRelease(display_link_);
 }
 
 bool DisplayLinkMac::GetVSyncParameters(