Do not include <Security/cssm.h> on iOS as it does not exist.

crypto/signature_creator.h

 // Copyright (c) 2012 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.
 
 #ifndef CRYPTO_SIGNATURE_CREATOR_H_
 #define CRYPTO_SIGNATURE_CREATOR_H_
 
 #include "build/build_config.h"
 
 #if defined(USE_OPENSSL)
 // Forward declaration for openssl/*.h
 typedef struct env_md_ctx_st EVP_MD_CTX;
 #elif defined(USE_NSS)
 // Forward declaration.
 struct SGNContextStr;
-#elif defined(OS_MACOSX)
+#elif defined(OS_MACOSX) && !defined(OS_IOS)
 #include <Security/cssm.h>
 #endif
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "crypto/crypto_export.h"
 
 #if defined(OS_WIN)
 #include "crypto/scoped_capi_types.h"
@@ skipping 22 matching lines @@
  private:
   // Private constructor. Use the Create() method instead.
   SignatureCreator();
 
   RSAPrivateKey* key_;
 
 #if defined(USE_OPENSSL)
   EVP_MD_CTX* sign_context_;
 #elif defined(USE_NSS)
   SGNContextStr* sign_context_;
-#elif defined(OS_MACOSX)
+#elif defined(OS_MACOSX) && !defined(OS_IOS)
   CSSM_CC_HANDLE sig_handle_;
 #elif defined(OS_WIN)
   ScopedHCRYPTHASH hash_object_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(SignatureCreator);
 };
 
 }  // namespace crypto
 
 #endif  // CRYPTO_SIGNATURE_CREATOR_H_