Rewrite std::string("") to std::string(), Linux edition.

crypto/ec_signature_creator_unittest.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 "crypto/ec_signature_creator.h"
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 12 matching lines @@
   EXPECT_FALSE(signer->Sign(NULL, 0, NULL));
 }
 #else
 TEST(ECSignatureCreatorTest, BasicTest) {
   // Do a verify round trip.
   scoped_ptr<crypto::ECPrivateKey> key_original(
       crypto::ECPrivateKey::Create());
   ASSERT_TRUE(key_original.get());
 
   std::vector<uint8> key_info;
-  ASSERT_TRUE(key_original->ExportEncryptedPrivateKey("", 1000, &key_info));
+  ASSERT_TRUE(
+      key_original->ExportEncryptedPrivateKey(std::string(), 1000, &key_info));
   std::vector<uint8> pubkey_info;
   ASSERT_TRUE(key_original->ExportPublicKey(&pubkey_info));
 
   scoped_ptr<crypto::ECPrivateKey> key(
-      crypto::ECPrivateKey::CreateFromEncryptedPrivateKeyInfo("", key_info,
-                                                              pubkey_info));
+      crypto::ECPrivateKey::CreateFromEncryptedPrivateKeyInfo(
+          std::string(), key_info, pubkey_info));
   ASSERT_TRUE(key.get());
   ASSERT_TRUE(key->key() != NULL);
 
   scoped_ptr<crypto::ECSignatureCreator> signer(
       crypto::ECSignatureCreator::Create(key.get()));
   ASSERT_TRUE(signer.get());
 
   std::string data("Hello, World!");
   std::vector<uint8> signature;
   ASSERT_TRUE(signer->Sign(reinterpret_cast<const uint8*>(data.c_str()),
@@ skipping 14 matching lines @@
   ASSERT_TRUE(verifier.VerifyInit(
       kECDSAWithSHA256AlgorithmID, sizeof(kECDSAWithSHA256AlgorithmID),
       &signature[0], signature.size(),
       &public_key_info.front(), public_key_info.size()));
 
   verifier.VerifyUpdate(reinterpret_cast<const uint8*>(data.c_str()),
                         data.size());
   ASSERT_TRUE(verifier.VerifyFinal());
 }
 #endif  // !defined(USE_OPENSSL)