Remove #pragma once. Just from base/ for now.

base/i18n/bidi_line_iterator.h

 // Copyright (c) 2011 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 BASE_I18N_BIDI_LINE_ITERATOR_H_
 #define BASE_I18N_BIDI_LINE_ITERATOR_H_
-#pragma once
 
 #include "unicode/ubidi.h"
 
 #include "base/basictypes.h"
 #include "base/i18n/base_i18n_export.h"
 #include "base/string16.h"
 
 namespace base {
 namespace i18n {
 
@@ skipping 21 matching lines @@
  private:
   UBiDi* bidi_;
 
   DISALLOW_COPY_AND_ASSIGN(BiDiLineIterator);
 };
 
 }  // namespace i18n
 }  // namespace base
 
 #endif  // BASE_I18N_BIDI_LINE_ITERATOR_H_