Use a direct include of strings headers in extensions/, google_apis/, gpu/.

google_apis/cup/client_update_protocol.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 "google_apis/cup/client_update_protocol.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sha1.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "crypto/hmac.h"
 #include "crypto/random.h"
 
 namespace {
 
 base::StringPiece ByteVectorToSP(const std::vector<uint8>& vec) {
   if (vec.empty())
     return base::StringPiece();
 
   return base::StringPiece(reinterpret_cast<const char*>(&vec[0]), vec.size());
@@ skipping 273 matching lines @@
   // Encrypt the key source (r) using the public key (pk[v]) to generate the
   // encrypted key source (w).
   if (!EncryptKeySource(source))
     return false;
   if (encrypted_key_source_.size() != PublicKeyLength())
     return false;
 
   return true;
 }