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

net/ssl/ssl_platform_key_mac.cc

Index: net/ssl/ssl_platform_key_mac.cc
diff --git a/net/ssl/ssl_platform_key_mac.cc b/net/ssl/ssl_platform_key_mac.cc
index ec7cb42f0dbe42450732917036aaf2f628d9cc79..050189b7af46c70333485a5982d0e356e223c7f0 100644
--- a/net/ssl/ssl_platform_key_mac.cc
+++ b/net/ssl/ssl_platform_key_mac.cc
@@ -34,6 +34,11 @@
 
 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 {
 
 class ScopedCSSM_CC_HANDLE {
@@ -241,4 +246,6 @@ scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
       GetSSLPlatformKeyTaskRunner()));
 }
 
+#pragma clang diagnostic pop  // "-Wdeprecated-declarations"
+
 }  // namespace net