cryptohome: Make CryptohomeClient::Unmount non-blocking

chromeos/dbus/fake_cryptohome_client.cc

 // Copyright 2013 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 "chromeos/dbus/fake_cryptohome_client.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
@@ skipping 72 matching lines @@
     pending_wait_for_service_to_be_available_callbacks_.push_back(callback);
   }
 }
 
 void FakeCryptohomeClient::IsMounted(
     const BoolDBusMethodCallback& callback) {
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback, DBUS_METHOD_CALL_SUCCESS, true));
 }
 
-bool FakeCryptohomeClient::Unmount(bool* success) {
-  *success = unmount_result_;
-  return true;
+void FakeCryptohomeClient::Unmount(const BoolDBusMethodCallback& callback) {
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE,
+      base::Bind(callback, DBUS_METHOD_CALL_SUCCESS, unmount_result_));
 }
 
 void FakeCryptohomeClient::AsyncCheckKey(
     const cryptohome::Identification& cryptohome_id,
     const std::string& key,
     const AsyncMethodCallback& callback) {
   ReturnAsyncMethodResult(callback);
 }
 
 void FakeCryptohomeClient::AsyncMigrateKey(
@@ skipping 577 matching lines @@
   if (!dircrypto_migration_progress_handler_.is_null()) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(dircrypto_migration_progress_handler_,
                               cryptohome::DIRCRYPTO_MIGRATION_IN_PROGRESS,
                               dircrypto_migration_progress_,
                               kDircryptoMigrationMaxProgress));
   }
 }
 
 }  // namespace chromeos