Convert //ios from scoped_ptr to std::unique_ptr.

ios/web/webui/crw_web_ui_manager.h

Index: ios/web/webui/crw_web_ui_manager.h
diff --git a/ios/web/webui/crw_web_ui_manager.h b/ios/web/webui/crw_web_ui_manager.h
index a4b805325d6485edecc7bdf0b50b67f62e64647a..b9550d2caf2411666eb6ad98d2addfaece3de26e 100644
--- a/ios/web/webui/crw_web_ui_manager.h
+++ b/ios/web/webui/crw_web_ui_manager.h
@@ -7,6 +7,8 @@
 
 #import <Foundation/Foundation.h>
 
+#include <memory>
+
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 #import "ios/web/webui/url_fetcher_block_adapter.h"
 
@@ -31,9 +33,9 @@ class WebStateImpl;
 
 // Returns URLFetcherBlockAdapter for fetching resource for URL. Can be
 // overwritten by test classes to mock resource retrieval.
-- (scoped_ptr<web::URLFetcherBlockAdapter>)
-        fetcherForURL:(const GURL&)URL
-    completionHandler:(web::URLFetcherBlockAdapterCompletion)handler;
+- (std::unique_ptr<web::URLFetcherBlockAdapter>)
+    fetcherForURL:(const GURL&)URL
+completionHandler:(web::URLFetcherBlockAdapterCompletion)handler;
 
 @end