Convert //chrome/browser/ui from scoped_ptr to std::unique_ptr

chrome/browser/ui/cocoa/passwords/account_avatar_fetcher_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 "chrome/browser/ui/cocoa/passwords/account_avatar_fetcher_manager.h"
 
 #include <utility>
 
 #include "base/mac/foundation_util.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 49 matching lines @@
     requestContext_ = requestContext;
   }
   return self;
 }
 
 - (void)startRequestWithFetcher:(AccountAvatarFetcher*)fetcher {
   fetcher->Start(requestContext_.get());
 }
 
 - (void)fetchAvatar:(const GURL&)avatarURL forView:(CredentialItemButton*)view {
-  scoped_ptr<AccountAvatarFetcherBridge> bridge(
+  std::unique_ptr<AccountAvatarFetcherBridge> bridge(
       new AccountAvatarFetcherBridge(self, view));
   AccountAvatarFetcher* fetcher =
       new AccountAvatarFetcher(avatarURL, bridge->AsWeakPtr());
   bridges_.push_back(std::move(bridge));
   [self startRequestWithFetcher:fetcher];
 }
 
 - (void)updateAvatar:(NSImage*)image
           fromBridge:(AccountAvatarFetcherBridge*)bridge
              forView:(CredentialItemButton*)view {
   [view setImage:image];
   auto it = std::find(bridges_.begin(), bridges_.end(), bridge);
   if (it != bridges_.end())
     bridges_.erase(it);
 }
 
 @end