Move more string_util functions to base namespace.

ui/app_list/search/term_break_iterator.cc

 // Copyright 2013 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 "ui/app_list/search/term_break_iterator.h"
 
 #include "base/i18n/char_iterator.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "third_party/icu/source/common/unicode/uchar.h"
@@ skipping 36 matching lines @@
 
   return prev_ != pos_ || !iter_->end();
 }
 
 const base::string16 TermBreakIterator::GetCurrentTerm() const {
   DCHECK(prev_ != npos && pos_ != npos);
   return word_.substr(prev_, pos_ - prev_);
 }
 
 TermBreakIterator::State TermBreakIterator::GetNewState(base::char16 ch) {
-  if (IsAsciiDigit(ch) || ch == '.' || ch == ',')
+  if (base::IsAsciiDigit(ch) || ch == '.' || ch == ',')
     return STATE_NUMBER;
 
   const bool is_upper = !!u_isUUppercase(ch);
   const bool is_lower = !!u_isULowercase(ch);
 
   if (is_upper && is_lower) {
     NOTREACHED() << "Invalid state for ch=" << ch;
     return STATE_CHAR;
   }
 
   if (is_upper)
     return STATE_UPPER;
   if (is_lower)
     return STATE_LOWER;
 
   return STATE_CHAR;
 }
 
 }  // namespace app_list