Mojo C++ bindings: switch components/filesystem mojom target to use STL types.

components/filesystem/util.h

 // Copyright 2015 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.
 
 #ifndef COMPONENTS_FILESYSTEM_UTIL_H_
 #define COMPONENTS_FILESYSTEM_UTIL_H_
 
 #include <stdint.h>
 
 #include "base/files/file.h"
 #include "components/filesystem/public/interfaces/types.mojom.h"
 
 namespace mojo {
 class String;
 }
 
 namespace filesystem {
 
 // Validation functions (typically used to check arguments; they return
 // |ERROR_OK| if valid, else the standard/recommended error for the validation
 // error):
 
-// Checks if |path|, which must be non-null, is (looks like) a valid (relative)
-// path. (On failure, returns |ERROR_INVALID_ARGUMENT| if |path| is not UTF-8,
-// or |ERROR_PERMISSION_DENIED| if it is not relative.)
-mojom::FileError IsPathValid(const mojo::String& path);
+// Checks if |path| is (looks like) a valid (relative) path. (On failure,
+// returns |ERROR_INVALID_ARGUMENT| if |path| is not UTF-8, or
+// |ERROR_PERMISSION_DENIED| if it is not relative.)
+mojom::FileError IsPathValid(const std::string& path);
 
 // Checks if |whence| is a valid (known) |Whence| value. (On failure, returns
 // |ERROR_UNIMPLEMENTED|.)
 mojom::FileError IsWhenceValid(mojom::Whence whence);
 
 // Checks if |offset| is a valid file offset (from some point); this is
 // implementation-dependent (typically checking if |offset| fits in an |off_t|).
 // (On failure, returns |ERROR_OUT_OF_RANGE|.)
 mojom::FileError IsOffsetValid(int64_t offset);
 
 // Conversion functions:
 
 // Returns the platform dependent error details converted to the
 // filesystem.Error enum.
 mojom::FileError GetError(const base::File& file);
 
 // Serializes Info to the wire format.
 mojom::FileInformationPtr MakeFileInformation(const base::File::Info& info);
 
 // Creates an absolute file path and ensures that we don't try to traverse up.
-mojom::FileError ValidatePath(const mojo::String& raw_path,
+mojom::FileError ValidatePath(const std::string& raw_path,
                               const base::FilePath& filesystem_base,
                               base::FilePath* out);
 
 }  // namespace filesystem
 
 #endif  // COMPONENTS_FILESYSTEM_UTIL_H_