drive: Change FileCache::GetCacheEntry's return type to FileError

chrome/browser/chromeos/drive/file_system/download_operation_unittest.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 "chrome/browser/chromeos/drive/file_system/download_operation.h"
 
 #include "base/file_util.h"
 #include "base/task_runner_util.h"
 #include "chrome/browser/chromeos/drive/fake_free_disk_space_getter.h"
 #include "chrome/browser/chromeos/drive/file_cache.h"
@@ skipping 127 matching lines @@
   ASSERT_TRUE(entry);
   EXPECT_FALSE(entry->file_specific_info().is_hosted_document());
 
   // The transfered file is cached and the change of "offline available"
   // attribute is notified.
   EXPECT_EQ(1U, observer()->get_changed_paths().size());
   EXPECT_EQ(1U, observer()->get_changed_paths().count(file_in_root.DirName()));
 
   // The cache entry should be removed in order to free up space.
   FileCacheEntry cache_entry;
-  bool result = true;
   base::PostTaskAndReplyWithResult(
       blocking_task_runner(),
       FROM_HERE,
       base::Bind(&internal::FileCache::GetCacheEntry,
                  base::Unretained(cache()),
                  "<id>",
                  &cache_entry),
-      google_apis::test_util::CreateCopyResultCallback(&result));
+      google_apis::test_util::CreateCopyResultCallback(&error));
   test_util::RunBlockingPoolTask();
-  ASSERT_FALSE(result);
+  EXPECT_EQ(FILE_ERROR_NOT_FOUND, error);
 }
 
 TEST_F(DownloadOperationTest,
        EnsureFileDownloadedByPath_FromServer_EnoughSpaceButBecomeFull) {
   base::FilePath file_in_root(FILE_PATH_LITERAL("drive/root/File 1.txt"));
   ResourceEntry src_entry;
   ASSERT_EQ(FILE_ERROR_OK, GetLocalResourceEntry(file_in_root, &src_entry));
   const int64 file_size = src_entry.file_info().size();
 
   // Pretend we have enough space first (checked before downloading a file),
@@ skipping 337 matching lines @@
   // Cancel immediately.
   ASSERT_FALSE(cancel_closure.is_null());
   cancel_closure.Run();
   test_util::RunBlockingPoolTask();
 
   EXPECT_EQ(FILE_ERROR_ABORT, error);
 }
 
 }  // namespace file_system
 }  // namespace drive