Refactor AppendToFile and WriteFileDescriptor

components/policy/core/common/policy_loader_win_unittest.cc

 // Copyright (c) 2012 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/policy/core/common/policy_loader_win.h"
 
 #include <windows.h>
 #include <userenv.h>
 
 #include <algorithm>
@@ skipping 570 matching lines @@
   uint8* type_data = reinterpret_cast<uint8*>(&type);
   buffer.insert(buffer.end(), type_data, type_data + sizeof(DWORD));
   AppendChars(&buffer, L";");
   size = base::ByteSwapToLE32(size);
   uint8* size_data = reinterpret_cast<uint8*>(&size);
   buffer.insert(buffer.end(), size_data, size_data + sizeof(DWORD));
   AppendChars(&buffer, L";");
   buffer.insert(buffer.end(), data, data + size);
   AppendChars(&buffer, L"]");
 
-  ASSERT_EQ(buffer.size(),
-            base::AppendToFile(
-                preg_file_path_,
-                reinterpret_cast<const char*>(vector_as_array(&buffer)),
-                buffer.size()));
+  ASSERT_TRUE(base::AppendToFile(
+      preg_file_path_,
+      reinterpret_cast<const char*>(vector_as_array(&buffer)),
+      buffer.size()));
 }
 
 void PRegTestHarness::AppendDWORDToPRegFile(const base::string16& path,
                                             const std::string& key,
                                             DWORD value) {
   value = base::ByteSwapToLE32(value);
   AppendRecordToPRegFile(path, key, REG_DWORD, sizeof(DWORD),
                          reinterpret_cast<uint8*>(&value));
 }
 
@@ skipping 603 matching lines @@
   PolicyMap& expected_policy = expected.Get(ns);
   expected_policy.Set("alternative_browser_path",
                       POLICY_LEVEL_MANDATORY, POLICY_SCOPE_MACHINE,
                       new base::StringValue("c:\\legacy\\browser.exe"), NULL);
   expected_policy.Set("url_list", POLICY_LEVEL_MANDATORY, POLICY_SCOPE_MACHINE,
                       list.DeepCopy(), NULL);
   EXPECT_TRUE(Matches(expected));
 }
 
 }  // namespace policy