Convert crypto to std::unique_ptr

crypto/hmac.h

Index: crypto/hmac.h
diff --git a/crypto/hmac.h b/crypto/hmac.h
index ccdab3092bdf86f923f00eb00ad1581b7e5c4660..ec32ed7cd1c56d63a78fe2694b9dc4ae22d53d30 100644
--- a/crypto/hmac.h
+++ b/crypto/hmac.h
@@ -10,9 +10,10 @@
 
 #include <stddef.h>
 
+#include <memory>
+
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/string_piece.h"
 #include "crypto/crypto_export.h"
 
@@ -85,7 +86,7 @@ class CRYPTO_EXPORT HMAC {
 
  private:
   HashAlgorithm hash_alg_;
-  scoped_ptr<HMACPlatformData> plat_;
+  std::unique_ptr<HMACPlatformData> plat_;
 
   DISALLOW_COPY_AND_ASSIGN(HMAC);
 };