Require FLAG_WRITE when FLAG_CREATE_ALWAYS is specified

base/files/file_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 "base/file_util.h"
 #include "base/files/file.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 60 matching lines @@
     // Create a file that exists.
     File file(file_path, base::File::FLAG_CREATE | base::File::FLAG_READ);
     EXPECT_FALSE(file.IsValid());
     EXPECT_FALSE(file.created());
     EXPECT_EQ(base::File::FILE_ERROR_EXISTS, file.error_details());
   }
 
   {
     // Create or overwrite a file.
     File file(file_path,
-              base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_READ);
+              base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE);
     EXPECT_TRUE(file.IsValid());
     EXPECT_TRUE(file.created());
     EXPECT_EQ(base::File::FILE_OK, file.error_details());
   }
 
   {
     // Create a delete-on-close file.
     file_path = temp_dir.path().AppendASCII("create_file_2");
     File file(file_path,
               base::File::FLAG_OPEN_ALWAYS | base::File::FLAG_READ |
@@ skipping 350 matching lines @@
                    NULL));
   ASSERT_TRUE(dir.IsValid());
 
   base::File::Info info;
   EXPECT_TRUE(dir.GetInfo(&info));
   EXPECT_TRUE(info.is_directory);
   EXPECT_FALSE(info.is_symbolic_link);
   EXPECT_EQ(0, info.size);
 }
 #endif  // defined(OS_WIN)