Use a direct include of strings headers in chrome/browser/ui/a*/.

chrome/browser/ui/app_list/search/tokenized_string_match.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_APP_LIST_SEARCH_TOKENIZED_STRING_MATCH_H_
 #define CHROME_BROWSER_UI_APP_LIST_SEARCH_TOKENIZED_STRING_MATCH_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "ui/base/range/range.h"
 
 namespace app_list {
 
 class TokenizedString;
 
 // TokenizedStringMatch takes two tokenized strings: one as the text and
 // the other one as the query. It matches the query against the text,
 // calculates a relevance score between [0, 1] and marks the matched portions
 // of text. A relevance of zero means the two are completely different to each
@@ skipping 19 matching lines @@
  private:
   double relevance_;
   Hits hits_;
 
   DISALLOW_COPY_AND_ASSIGN(TokenizedStringMatch);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_TOKENIZED_STRING_MATCH_H_