run iwyu on base!

base/string_split.cc

 // Copyright (c) 2010 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/string_split.h"
+#include <stddef.h>
+#include <string>
+#include <utility>
+#include <vector>
 
 #include "base/logging.h"
+#include "base/string16.h"
 #include "base/string_util.h"
 #include "base/third_party/icu/icu_utf.h"
-#include "base/utf_string_conversions.h"
 
 namespace base {
 
 template<typename STR>
 static void SplitStringT(const STR& str,
                          const typename STR::value_type s,
                          bool trim_whitespace,
                          std::vector<STR>* r) {
   size_t last = 0;
   size_t i;
@@ skipping 198 matching lines @@
   SplitStringAlongWhitespaceT(str, result);
 }
 #endif
 
 void SplitStringAlongWhitespace(const std::string& str,
                                 std::vector<std::string>* result) {
   SplitStringAlongWhitespaceT(str, result);
 }
 
 }  // namespace base