external/boringssl: Sync to 915c121bb5d424e09bf05c3aabf172a44e958e28.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/ea52ec98a56a40879b37493f3d1da1a1679e1fba..915c121bb5d424e09bf05c3aabf172a44e958e28

Test: BoringSSL CTS Presubmits
Change-Id: I3f5eba69372b484e19f4ca250c81f208aa5d3dc5
diff --git a/src/crypto/x509/x509_test.cc b/src/crypto/x509/x509_test.cc
index 158fd45..b4cecca 100644
--- a/src/crypto/x509/x509_test.cc
+++ b/src/crypto/x509/x509_test.cc
@@ -835,7 +835,7 @@
 
   /* This ensures the X509 took a reference to |buf|, otherwise this will be a
    * reference to free memory and ASAN should notice. */
-  ASSERT_EQ(CBS_ASN1_SEQUENCE, enc_pointer[0]);
+  ASSERT_EQ(0x30, enc_pointer[0]);
 }
 
 TEST(X509Test, TestFromBufferWithTrailingData) {