Fixes for re-enabling more MSVC level 4 warnings: base/ edition

base/i18n/break_iterator.cc

 // 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.
 
 #include "base/i18n/break_iterator.h"
 
 #include "base/logging.h"
 #include "third_party/icu/source/common/unicode/ubrk.h"
 #include "third_party/icu/source/common/unicode/uchar.h"
 #include "third_party/icu/source/common/unicode/ustring.h"
 
 namespace base {
 namespace i18n {
 
-const size_t npos = -1;
+const size_t npos = static_cast<size_t>(-1);
 
 BreakIterator::BreakIterator(const string16& str, BreakType break_type)
     : iter_(NULL),
       string_(str),
       break_type_(break_type),
       prev_(npos),
       pos_(0) {
 }
 
 BreakIterator::BreakIterator(const string16& str, const string16& rules)
@@ skipping 137 matching lines @@
   return (!!boundary && next_status != UBRK_WORD_NONE);
 }
 
 string16 BreakIterator::GetString() const {
   DCHECK(prev_ != npos && pos_ != npos);
   return string_.substr(prev_, pos_ - prev_);
 }
 
 }  // namespace i18n
 }  // namespace base