Reimplement devfs in dart. Implementation now writes to disk.

runtime/vm/dart_api_impl_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/builtin.h"
 #include "vm/compiler.h"
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 #include "include/dart_tools_api.h"
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
 #include "platform/utils.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
-#include "vm/dev_fs.h"
 #include "vm/lockers.h"
 #include "vm/timeline.h"
 #include "vm/unit_test.h"
 #include "vm/verifier.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, verify_acquired_data);
 DECLARE_FLAG(bool, ignore_patch_signature_mismatch);
 DECLARE_FLAG(bool, support_externalizable_strings);
@@ skipping 10129 matching lines @@
   result = Dart_Invoke(lib,
                        NewString("foozoo"),
                        0,
                        NULL);
   EXPECT(Dart_IsError(result));
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart