Add RSAPrivateKey stub implementation for iOS.

crypto/crypto.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Put all transitive dependencies for Windows HMAC here.
     # This is required so that we can build them for nacl win64.
     'hmac_win64_related_sources': [
@@ skipping 138 matching lines @@
               'openssl_util.cc',
               'openssl_util.h',
               'rsa_private_key_openssl.cc',
               'secure_hash_openssl.cc',
               'signature_creator_openssl.cc',
               'signature_verifier_openssl.cc',
               'symmetric_key_openssl.cc',
             ],
         },],
       ],
+      'target_conditions' : [
+        [ 'OS == "ios"', {
+          'sources!': [
+            # This class is stubbed out on iOS.
+            'rsa_private_key.cc',
+          ],
+        }],
+      ],
       'sources': [
         # NOTE: all transitive dependencies of HMAC on windows need
         #     to be placed in the source list above.
         '<@(hmac_win64_related_sources)',
         'capi_util.cc',
         'capi_util.h',
         'crypto_export.h',
         'crypto_module_blocking_password_delegate.h',
         'cssm_init.cc',
         'cssm_init.h',
@@ skipping 25 matching lines @@
         'openpgp_symmetric_encryption.cc',
         'openpgp_symmetric_encryption.h',
         'openssl_util.cc',
         'openssl_util.h',
         'p224.cc',
         'p224.h',
         'random.h',
         'random.cc',
         'rsa_private_key.cc',
         'rsa_private_key.h',
+        'rsa_private_key_ios.cc',
         'rsa_private_key_mac.cc',
         'rsa_private_key_nss.cc',
         'rsa_private_key_openssl.cc',
         'rsa_private_key_win.cc',
         'scoped_capi_types.h',
         'scoped_nss_types.h',
         'secure_hash.h',
         'secure_hash_default.cc',
         'secure_hash_openssl.cc',
         'sha2.cc',
@@ skipping 121 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }