Fix non-noise cpplint errors in //crypto.

crypto/encryptor.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/encryptor.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 14 matching lines @@
     case 32: return EVP_aes_256_cbc();
     default:
       return nullptr;
   }
 }
 
 // On destruction this class will cleanup the ctx, and also clear the OpenSSL
 // ERR stack as a convenience.
 class ScopedCipherCTX {
  public:
-  explicit ScopedCipherCTX() {
+  ScopedCipherCTX() {
     EVP_CIPHER_CTX_init(&ctx_);
   }
   ~ScopedCipherCTX() {
     EVP_CIPHER_CTX_cleanup(&ctx_);
     ClearOpenSSLERRStack(FROM_HERE);
   }
   EVP_CIPHER_CTX* get() { return &ctx_; }
 
  private:
   EVP_CIPHER_CTX ctx_;
@@ skipping 171 matching lines @@
 
   // AES_ctr128_encrypt() updates |ivec|. Update the |counter_| here.
   SetCounter(base::StringPiece(reinterpret_cast<const char*>(ivec),
                                AES_BLOCK_SIZE));
 
   output->swap(result);
   return true;
 }
 
 }  // namespace crypto