net: Update FileStream to use base::File instead of PlatformFile.

base/files/file_posix.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/files/file.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ skipping 107 matching lines @@
 #endif  // defined(OS_NACL)
 
 }  // namespace
 
 // NaCl doesn't implement system calls to open files directly.
 #if !defined(OS_NACL)
 // TODO(erikkay): does it make sense to support FLAG_EXCLUSIVE_* here?
 void File::InitializeUnsafe(const FilePath& name, uint32 flags) {
   base::ThreadRestrictions::AssertIOAllowed();
   DCHECK(!IsValid());
-  DCHECK(!(flags & FLAG_ASYNC));
 
   int open_flags = 0;
   if (flags & FLAG_CREATE)
     open_flags = O_CREAT | O_EXCL;
 
   created_ = false;
 
   if (flags & FLAG_CREATE_ALWAYS) {
     DCHECK(!open_flags);
     open_flags = O_CREAT | O_TRUNC;
@@ skipping 45 matching lines @@
       open_flags |= O_CREAT;
       if (flags & FLAG_EXCLUSIVE_READ || flags & FLAG_EXCLUSIVE_WRITE)
         open_flags |= O_EXCL;   // together with O_CREAT implies O_NOFOLLOW
 
       descriptor = HANDLE_EINTR(open(name.value().c_str(), open_flags, mode));
       if (descriptor >= 0)
         created_ = true;
     }
   }
 
-  if (descriptor >= 0 && (flags & (FLAG_CREATE_ALWAYS | FLAG_CREATE)))
+  if (descriptor < 0) {
+    error_details_ = File::OSErrorToFileError(errno);
+    return;
+  }
+
+  if (flags & (FLAG_CREATE_ALWAYS | FLAG_CREATE))
     created_ = true;
 
-  if ((descriptor >= 0) && (flags & FLAG_DELETE_ON_CLOSE))
+  if (flags & FLAG_DELETE_ON_CLOSE)
     unlink(name.value().c_str());
 
-  if (descriptor >= 0)
-    error_details_ = FILE_OK;
-  else
-    error_details_ = File::OSErrorToFileError(errno);
-
+  async_ = ((flags & FLAG_ASYNC) == FLAG_ASYNC);
+  error_details_ = FILE_OK;
   file_ = descriptor;
 }
 #endif  // !defined(OS_NACL)
 
 bool File::IsValid() const {
   return file_ >= 0;
 }
 
 PlatformFile File::TakePlatformFile() {
   PlatformFile file = file_;
@@ skipping 256 matching lines @@
       return FILE_ERROR_FAILED;
   }
 }
 
 void File::SetPlatformFile(PlatformFile file) {
   DCHECK_EQ(file_, kInvalidPlatformFileValue);
   file_ = file;
 }
 
 }  // namespace base