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

net/cert/x509_certificate_mac.cc

Index: net/cert/x509_certificate_mac.cc
diff --git a/net/cert/x509_certificate_mac.cc b/net/cert/x509_certificate_mac.cc
index e27576ab26592475dafd3578081694eb31b78dba..83f8993dabd7b588a2126c9537d291caaced5e8c 100644
--- a/net/cert/x509_certificate_mac.cc
+++ b/net/cert/x509_certificate_mac.cc
@@ -29,6 +29,11 @@ using base::Time;
 
 namespace net {
 
+// 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"
+
 namespace {
 
 void GetCertDistinguishedName(
@@ -573,4 +578,6 @@ bool X509Certificate::IsSelfSigned(OSCertHandle cert_handle) {
   return true;
 }
 
+#pragma clang diagnostic pop  // "-Wdeprecated-declarations"
+
 }  // namespace net