Convert crypto to std::unique_ptr

crypto/hmac.cc

Index: crypto/hmac.cc
diff --git a/crypto/hmac.cc b/crypto/hmac.cc
index e9869b4fe1119cf38e0e368e6f9c27d89f1db91b..333e357f90c327689b9909b152fe1f6af22ddc5e 100644
--- a/crypto/hmac.cc
+++ b/crypto/hmac.cc
@@ -7,6 +7,7 @@
 #include <stddef.h>
 
 #include <algorithm>
+#include <memory>
 
 #include "base/logging.h"
 #include "crypto/secure_util.h"
@@ -47,7 +48,7 @@ bool HMAC::VerifyTruncated(const base::StringPiece& data,
   if (digest.empty())
     return false;
   size_t digest_length = DigestLength();
-  scoped_ptr<unsigned char[]> computed_digest(
+  std::unique_ptr<unsigned char[]> computed_digest(
       new unsigned char[digest_length]);
   if (!Sign(data, computed_digest.get(), digest_length))
     return false;