Fix a bunch of IWYU violators that don't include scoped_ptr.h

components/signin/core/account_id/account_id.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 "components/signin/core/account_id/account_id.h"
 
 #include <functional>
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 
 namespace {
 
 // Known account types.
 const char kGoogle[] = "google";
 
@@ skipping 168 matching lines @@
   return AccountId::EmptyAccountId::GetInstance()->user_id;
 }
 
 namespace BASE_HASH_NAMESPACE {
 
 std::size_t hash<AccountId>::operator()(const AccountId& user_id) const {
   return hash<std::string>()(user_id.GetUserEmail());
 }
 
 }  // namespace BASE_HASH_NAMESPACE