Convert //extensions/browser from scoped_ptr to std::unique_ptr

extensions/browser/extension_throttle_entry.cc

Index: extensions/browser/extension_throttle_entry.cc
diff --git a/extensions/browser/extension_throttle_entry.cc b/extensions/browser/extension_throttle_entry.cc
index 577ac55d661b3212d5cb3f4f2ad7cb64a8ffaae5..e81a7330d2293e4f8460394ab260ede524061eda 100644
--- a/extensions/browser/extension_throttle_entry.cc
+++ b/extensions/browser/extension_throttle_entry.cc
@@ -46,12 +46,12 @@ const int ExtensionThrottleEntry::kDefaultMaximumBackoffMs = 15 * 60 * 1000;
 const int ExtensionThrottleEntry::kDefaultEntryLifetimeMs = 2 * 60 * 1000;
 
 // Returns NetLog parameters when a request is rejected by throttling.
-scoped_ptr<base::Value> NetLogRejectedRequestCallback(
+std::unique_ptr<base::Value> NetLogRejectedRequestCallback(
     const std::string* url_id,
     int num_failures,
     const base::TimeDelta& release_after,
     net::NetLogCaptureMode /* capture_mode */) {
-  scoped_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
+  std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
   dict->SetString("url", *url_id);
   dict->SetInteger("num_failures", num_failures);
   dict->SetInteger("release_after_ms",