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

ios/web/webui/crw_web_ui_manager.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/webui/crw_web_ui_manager.h"
 
 #include "base/mac/bind_objc_block.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/scoped_vector.h"
 #import "base/strings/sys_string_conversions.h"
@@ skipping 34 matching lines @@
 
 // Removes fetcher from vector of active fetchers.
 - (void)removeFetcher:(web::URLFetcherBlockAdapter*)fetcher;
 
 @end
 
 @implementation CRWWebUIManager {
   // Set of live WebUI fetchers for retrieving data.
   ScopedVector<web::URLFetcherBlockAdapter> _fetchers;
   // Bridge to observe the web state from Objective-C.
-  scoped_ptr<web::WebStateObserverBridge> _webStateObserverBridge;
+  std::unique_ptr<web::WebStateObserverBridge> _webStateObserverBridge;
   // Weak WebStateImpl this CRWWebUIManager is associated with.
   web::WebStateImpl* _webState;
 }
 
 - (instancetype)init {
   NOTREACHED();
   return self;
 }
 
 - (instancetype)initWithWebState:(web::WebStateImpl*)webState {
@@ skipping 142 matching lines @@
 - (web::WebStateImpl*)webState {
   return _webState;
 }
 
 - (void)removeFetcher:(web::URLFetcherBlockAdapter*)fetcher {
   _fetchers.erase(std::find(_fetchers.begin(), _fetchers.end(), fetcher));
 }
 
 #pragma mark - Testing-Only Methods
 
-- (scoped_ptr<web::URLFetcherBlockAdapter>)
-        fetcherForURL:(const GURL&)URL
-    completionHandler:(web::URLFetcherBlockAdapterCompletion)handler {
-  return scoped_ptr<web::URLFetcherBlockAdapter>(
+- (std::unique_ptr<web::URLFetcherBlockAdapter>)
+    fetcherForURL:(const GURL&)URL
+completionHandler:(web::URLFetcherBlockAdapterCompletion)handler {
+  return std::unique_ptr<web::URLFetcherBlockAdapter>(
       new web::URLFetcherBlockAdapter(
           URL, _webState->GetBrowserState()->GetRequestContext(), handler));
 }
 
 @end