drive: FileCache::Store marks the entry as dirty if empty MD5 is given

chrome/browser/chromeos/drive/sync/entry_update_performer_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/sync/entry_update_performer.h"
 
 #include "base/callback_helpers.h"
 #include "base/file_util.h"
 #include "base/md5.h"
 #include "base/task_runner_util.h"
@@ skipping 30 matching lines @@
         !google_apis::test_util::WriteStringToFile(path, content))
       return FILE_ERROR_FAILED;
 
     // Store the file to cache.
     FileError error = FILE_ERROR_FAILED;
     base::PostTaskAndReplyWithResult(
         blocking_task_runner(),
         FROM_HERE,
         base::Bind(&FileCache::Store,
                    base::Unretained(cache()),
-                   local_id, base::MD5String(content), path,
+                   local_id, std::string(), path,
                    FileCache::FILE_OPERATION_COPY),
         google_apis::test_util::CreateCopyResultCallback(&error));
     test_util::RunBlockingPoolTask();
-    if (error != FILE_ERROR_OK)
-      return error;
-
-    // Add the dirty bit.
-    error = FILE_ERROR_FAILED;
-    scoped_ptr<base::ScopedClosureRunner> file_closer;
-    base::PostTaskAndReplyWithResult(
-        blocking_task_runner(),
-        FROM_HERE,
-        base::Bind(&FileCache::OpenForWrite,
-                   base::Unretained(cache()),
-                   local_id,
-                   &file_closer),
-        google_apis::test_util::CreateCopyResultCallback(&error));
-    test_util::RunBlockingPoolTask();
     return error;
   }
 
   scoped_ptr<EntryUpdatePerformer> performer_;
 };
 
 TEST_F(EntryUpdatePerformerTest, UpdateEntry) {
   base::FilePath src_path(
       FILE_PATH_LITERAL("drive/root/Directory 1/SubDirectory File 1.txt"));
   base::FilePath dest_path(
@@ skipping 290 matching lines @@
                  local_id,
                  &cache_entry),
       google_apis::test_util::CreateCopyResultCallback(&success));
   test_util::RunBlockingPoolTask();
   EXPECT_TRUE(success);
   EXPECT_FALSE(cache_entry.is_dirty());
 }
 
 }  // namespace internal
 }  // namespace drive