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

ios/chrome/browser/web_resource/web_resource_util_unittest.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 <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 15 matching lines @@
     return base::Bind(&WebResourceUtilTest::OnParseSuccess,
                       base::Unretained(this));
   }
 
   WebResourceService::ErrorCallback GetErrorCallback() {
     return base::Bind(&WebResourceUtilTest::OnParseError,
                       base::Unretained(this));
   }
 
   // Called on success.
-  void OnParseSuccess(scoped_ptr<base::Value> value) {
+  void OnParseSuccess(std::unique_ptr<base::Value> value) {
     success_called_ = true;
     value_ = std::move(value);
   }
 
   // Called on error.
   void OnParseError(const std::string& error) {
     error_called_ = true;
     error_ = error;
   }
 
   void FlushBackgroundTasks() {
     // The function is not synchronous, callbacks are not called before flushing
     // the tasks.
     EXPECT_FALSE(success_called_);
     EXPECT_FALSE(error_called_);
 
     web::WebThread::GetBlockingPool()->FlushForTesting();
     loop_.RunUntilIdle();
   }
 
   base::MessageLoop loop_;
   std::string error_;
-  scoped_ptr<base::Value> value_;
+  std::unique_ptr<base::Value> value_;
   bool error_called_;
   bool success_called_;
 };
 
 TEST_F(WebResourceUtilTest, Success) {
   const std::string kExpectedKey("foo");
   const std::string kExpectedValue("bar");
   std::string json = base::StringPrintf("{\"%s\":\"%s\"}", kExpectedKey.c_str(),
                                         kExpectedValue.c_str());
   GetIOSChromeParseJSONCallback().Run(json, GetSuccessCallback(),
@@ skipping 48 matching lines @@
 
   FlushBackgroundTasks();
 
   // The error callback is called.
   EXPECT_TRUE(error_called_);
   EXPECT_FALSE(success_called_);
   EXPECT_FALSE(error_.empty());
 }
 
 }  // namespace web_resource