Add RSAPrivateKey stub implementation for iOS.

crypto/crypto.gyp

Index: crypto/crypto.gyp
diff --git a/crypto/crypto.gyp b/crypto/crypto.gyp
index 33b6b17fea3bc58049de9149ca20622c73deddde..01ba8bd32ba5d15c397bb48d923617ad805a8e49 100644
--- a/crypto/crypto.gyp
+++ b/crypto/crypto.gyp
@@ -156,6 +156,13 @@
             ],
         },],
       ],
+      'target_conditions' : [

[stuartmorgan, 2012/08/14 10:00:39]

For posterity: the reason this is in a target_conditional is that we'll be add
some 'sources/' re-includes that have to be in a target_conditional, it's
cleaner to keep all the iOS stuff grouped, and we don't want to do it the other
way when we know we'll almost immediately change it.

+        [ 'OS == "ios"', {
+            'sources!': [

[stuartmorgan, 2012/08/14 10:00:39]

Indent this whole block 2 less.

[msarda, 2012/08/14 12:55:16]

Done.

+              'rsa_private_key.cc',

[stuartmorgan, 2012/08/14 10:00:39]

Add a comment above this line:
# This class is stubbed out on iOS.

[msarda, 2012/08/14 12:55:16]

Done.

+            ],
+        }],
+      ],
       'sources': [
         # NOTE: all transitive dependencies of HMAC on windows need
         #     to be placed in the source list above.
@@ -201,6 +208,7 @@
         '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',