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

net/ssl/client_cert_store_mac.cc

Index: net/ssl/client_cert_store_mac.cc
diff --git a/net/ssl/client_cert_store_mac.cc b/net/ssl/client_cert_store_mac.cc
index 06d7d0613c88560e00116bd86541565da31f4a7a..ec662b57bb87f60158be691f9d7e9c3de0784579 100644
--- a/net/ssl/client_cert_store_mac.cc
+++ b/net/ssl/client_cert_store_mac.cc
@@ -28,6 +28,11 @@ using base::ScopedCFTypeRef;
 
 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 {
 
 // Gets the issuer for a given cert, starting with the cert itself and
@@ -274,4 +279,6 @@ bool ClientCertStoreMac::SelectClientCertsGivenPreferredForTesting(
   return true;
 }
 
+#pragma clang diagnostic pop  // "-Wdeprecated-declarations"
+
 }  // namespace net