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

ios/chrome/browser/memory/memory_debugger.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/memory/memory_debugger.h"
 
 #include <stdint.h>
 
 #include "base/ios/ios_util.h"
 #import "base/mac/scoped_nsobject.h"
@@ skipping 24 matching lines @@
   base::scoped_nsobject<UILabel> _realMemoryUsedLabel;
   base::scoped_nsobject<UILabel> _xcodeGaugeLabel;
   base::scoped_nsobject<UILabel> _dirtyVirtualMemoryLabel;
 
   // Inputs for memory commands.
   base::scoped_nsobject<UITextField> _bloatField;
   base::scoped_nsobject<UITextField> _refreshField;
   base::scoped_nsobject<UITextField> _continuousMemoryWarningField;
 
   // A place to store the artifical memory bloat.
-  scoped_ptr<uint8_t> _bloat;
+  std::unique_ptr<uint8_t> _bloat;
 
   // Distance the view was pushed up to accomodate the keyboard.
   CGFloat _keyboardOffset;
 
   // The current orientation of the device.
   BOOL _currentOrientation;
 }
 
 - (instancetype)init {
   self = [super initWithFrame:CGRectZero];
@@ skipping 542 matching lines @@
   [alert addAction:[UIAlertAction actionWithTitle:@"OK"
                                             style:UIAlertActionStyleDefault
                                           handler:nil]];
   [[[[UIApplication sharedApplication] keyWindow] rootViewController]
       presentViewController:alert
                    animated:YES
                  completion:nil];
 }
 
 @end