Suppress the clang warning "-Wdeprecated-declarations" for CSSM API calls.

net/cert/cert_verify_proc_mac.cc

Index: net/cert/cert_verify_proc_mac.cc
diff --git a/net/cert/cert_verify_proc_mac.cc b/net/cert/cert_verify_proc_mac.cc
index c4e0c41ba92fff6dddddbddfe4630e570986063c..bda875a3a3d202f91c905d19d333ccb4c6083d05 100644
--- a/net/cert/cert_verify_proc_mac.cc
+++ b/net/cert/cert_verify_proc_mac.cc
@@ -32,6 +32,11 @@
 #include "net/cert/x509_certificate.h"
 #include "net/cert/x509_util_mac.h"
 
+// CSSM functions are deprecated as of OSX 10.7, but have no replacement.
+// https://bugs.chromium.org/p/chromium/issues/detail?id=590914#c1
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+
 // From 10.7.2 libsecurity_keychain-55035/lib/SecTrustPriv.h, for use with
 // SecTrustCopyExtendedResult.
 #ifndef kSecEVOrganizationName
@@ -834,4 +839,6 @@ int CertVerifyProcMac::VerifyInternal(
   return OK;
 }
 
+#pragma clang diagnostic pop  // "-Wdeprecated-declarations"
+
 }  // namespace net