Update SupportsUserData uses with unique_ptr.

content/test/web_contents_observer_sanity_checker.cc

Index: content/test/web_contents_observer_sanity_checker.cc
diff --git a/content/test/web_contents_observer_sanity_checker.cc b/content/test/web_contents_observer_sanity_checker.cc
index eedbb8909b13d36e920c1661630ae08ec19da275..0389fbf07ed758ca94d282c61a4f1e696ed46288 100644
--- a/content/test/web_contents_observer_sanity_checker.cc
+++ b/content/test/web_contents_observer_sanity_checker.cc
@@ -4,6 +4,7 @@
 
 #include "content/test/web_contents_observer_sanity_checker.h"
 
+#include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
@@ -35,8 +36,9 @@ GlobalRoutingID GetRoutingPair(RenderFrameHost* host) {
 void WebContentsObserverSanityChecker::Enable(WebContents* web_contents) {
   if (web_contents->GetUserData(&kWebContentsObserverSanityCheckerKey))
     return;
-  web_contents->SetUserData(&kWebContentsObserverSanityCheckerKey,
-                            new WebContentsObserverSanityChecker(web_contents));
+  web_contents->SetUserData(
+      &kWebContentsObserverSanityCheckerKey,
+      base::WrapUnique(new WebContentsObserverSanityChecker(web_contents)));
 }
 
 void WebContentsObserverSanityChecker::RenderFrameCreated(