Convert //chrome from scoped_ptr to std::unique_ptr

chrome/utility/chrome_content_utility_client.cc

Index: chrome/utility/chrome_content_utility_client.cc
diff --git a/chrome/utility/chrome_content_utility_client.cc b/chrome/utility/chrome_content_utility_client.cc
index f00b01c9490bc88b9616ee64927d2377bdfc9f94..8bd49b41ab339f9c7cc56db93da6ead3a4bcff82 100644
--- a/chrome/utility/chrome_content_utility_client.cc
+++ b/chrome/utility/chrome_content_utility_client.cc
@@ -203,7 +203,7 @@ void ChromeContentUtilityClient::RegisterMojoServices(
 }
 
 void ChromeContentUtilityClient::AddHandler(
-    scoped_ptr<UtilityMessageHandler> handler) {
+    std::unique_ptr<UtilityMessageHandler> handler) {
   handlers_.push_back(std::move(handler));
 }