Condition SecKeyAlgorithm (re)declaration on min, not max version.

net/ssl/ssl_platform_key_mac.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/ssl/ssl_platform_key_mac.h"
 
 #include <dlfcn.h>
 #include <CoreFoundation/CoreFoundation.h>
 #include <Security/cssm.h>
 #include <Security/SecBase.h>
@@ skipping 21 matching lines @@
 #include "net/cert/x509_certificate.h"
 #include "net/ssl/ssl_platform_key.h"
 #include "net/ssl/ssl_platform_key_util.h"
 #include "net/ssl/ssl_private_key.h"
 #include "net/ssl/threaded_ssl_private_key.h"
 #include "third_party/boringssl/src/include/openssl/ecdsa.h"
 #include "third_party/boringssl/src/include/openssl/mem.h"
 #include "third_party/boringssl/src/include/openssl/nid.h"
 #include "third_party/boringssl/src/include/openssl/rsa.h"
 
-// TODO(davidben): Remove this after https://crbug.com/669240 is fixed.
 #if !defined(MAC_OS_X_VERSION_10_12) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_12
+    MAC_OS_X_VERSION_MIN_ALLOWED < MAC_OS_X_VERSION_10_12
+// Redeclare typedefs that only exist in 10.12+ to suppress
+// -Wpartial-availability warnings.
 typedef CFStringRef SecKeyAlgorithm;
 #endif
 
 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"
 
@@ skipping 366 matching lines @@
 }
 
 scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
     const X509Certificate* certificate) {
   return FetchClientCertPrivateKeyFromKeychain(certificate, nullptr);
 }
 
 #pragma clang diagnostic pop  // "-Wdeprecated-declarations"
 
 }  // namespace net