Use a direct include of strings headers in base/.

base/debug/profiler.cc

 // Copyright (c) 2012 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/debug/profiler.h"
 
 #include <string>
 
 #include "base/process_util.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 
 #if defined(OS_WIN)
 #include "base/win/pe_image.h"
 #endif  // defined(OS_WIN)
 
 #if defined(ENABLE_PROFILING) && !defined(NO_TCMALLOC)
 #include "third_party/tcmalloc/chromium/src/gperftools/profiler.h"
 #endif
 
 namespace base {
@@ skipping 146 matching lines @@
   ReturnAddressLocationResolver resolver_func = NULL;
   image.EnumImportChunks(FindResolutionFunctionInImports, &resolver_func);
 
   return resolver_func;
 }
 
 #endif  // defined(OS_WIN)
 
 }  // namespace debug
 }  // namespace base