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

ios/chrome/browser/crash_report/crash_report_multi_parameter.mm

 // Copyright 2014 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/chrome/browser/crash_report/crash_report_multi_parameter.h"
 
+#include <memory>
+
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #import "base/mac/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/values.h"
 #import "ios/chrome/browser/crash_report/breakpad_helper.h"
 
 namespace {
 // Maximum size of a breakpad parameter. he length of the dictionary serialized
 // into JSON cannot exceed this length. See declaration in (BreakPad.h) for
 // details.
 const int kMaximumBreakpadValueSize = 255;
 }
 
 @implementation CrashReportMultiParameter {
   base::scoped_nsobject<NSString> crashReportKey_;
-  scoped_ptr<base::DictionaryValue> dictionary_;
+  std::unique_ptr<base::DictionaryValue> dictionary_;
 }
 
 - (instancetype)init {
   NOTREACHED();
   return nil;
 }
 
 - (instancetype)initWithKey:(NSString*)key {
   if ((self = [super init])) {
     DCHECK([key length] && ([key length] <= kMaximumBreakpadValueSize));
@@ skipping 45 matching lines @@
     return;
   }
   breakpad_helper::AddReportParameter(
       crashReportKey_,
       [NSString stringWithCString:stateAsJson.c_str()
                          encoding:[NSString defaultCStringEncoding]],
       true);
 }
 
 @end