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

ios/chrome/browser/web_resource/web_resource_util.cc

 // 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.
 
 #include "ios/chrome/browser/web_resource/web_resource_util.h"
 
 #include "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/location.h"
 #include "base/task_runner.h"
@@ skipping 24 matching lines @@
 void ParseJSONOnBackgroundThread(
     base::TaskRunner* task_runner,
     const std::string& data,
     const WebResourceService::SuccessCallback& success_callback,
     const WebResourceService::ErrorCallback& error_callback) {
   if (data.empty()) {
     PostErrorTask(task_runner, error_callback, kInvalidDataTypeError);
     return;
   }
 
-  scoped_ptr<base::Value> value(base::JSONReader::Read(data));
+  std::unique_ptr<base::Value> value(base::JSONReader::Read(data));
   if (!value.get()) {
     // Page information not properly read, or corrupted.
     PostErrorTask(task_runner, error_callback, kInvalidDataTypeError);
     return;
   }
 
   if (!value->IsType(base::Value::TYPE_DICTIONARY)) {
     PostErrorTask(task_runner, error_callback, kUnexpectedJSONFormatError);
     return;
   }
@@ skipping 15 matching lines @@
                  success_callback, error_callback));
 }
 
 }  // namespace
 
 WebResourceService::ParseJSONCallback GetIOSChromeParseJSONCallback() {
   return base::Bind(&StartParseJSONAsync);
 }
 
 }  // namespace web_resource