Update from https://crrev.com/307664

crypto/p224_spake.h

Index: crypto/p224_spake.h
diff --git a/crypto/p224_spake.h b/crypto/p224_spake.h
index 61451a3a20cecfe54743226171ab2646029848ac..08769b76c247843e73fe2296793b157efecb2904 100644
--- a/crypto/p224_spake.h
+++ b/crypto/p224_spake.h
@@ -5,6 +5,7 @@
 #ifndef CRYPTO_P224_SPAKE_H_
 #define CRYPTO_P224_SPAKE_H_
 
+#include <base/gtest_prod_util.h>
 #include <base/strings/string_piece.h>
 #include <crypto/p224.h>
 #include <crypto/sha2.h>
@@ -14,7 +15,7 @@ namespace crypto {
 // P224EncryptedKeyExchange implements SPAKE2, a variant of Encrypted
 // Key Exchange. It allows two parties that have a secret common
 // password to establish a common secure key by exchanging messages
-// over unsecure channel without disclosing the password.
+// over an insecure channel without disclosing the password.
 //
 // The password can be low entropy as authenticating with an attacker only
 // gives the attacker a one-shot password oracle. No other information about
@@ -85,6 +86,13 @@ class CRYPTO_EXPORT P224EncryptedKeyExchange {
     kStateDone,
   };
 
+  FRIEND_TEST_ALL_PREFIXES(MutualAuth, ExpectedValues);
+
+  void Init();
+
+  // Sets internal random scalar. Should be used by tests only.
+  void SetXForTesting(const std::string& x);
+
   State state_;
   const bool is_server_;
   // next_message_ contains a value for GetMessage() to return.
@@ -104,7 +112,7 @@ class CRYPTO_EXPORT P224EncryptedKeyExchange {
   // file).
   uint8 x_[p224::kScalarBytes];
   // pw_ is SHA256(P(password), P(session))[:28] where P() prepends a uint32,
-  // big-endian length prefix (see paper refereneced in .cc file).
+  // big-endian length prefix (see paper referenced in .cc file).
   uint8 pw_[p224::kScalarBytes];
   // expected_authenticator_ is used to store the hash value expected from the
   // other party.