Add a variation of a stack to the base unittest umr flaky list.

base/data/purify/base_unittests.exe_UMR_flakey.txt

Index: base/data/purify/base_unittests.exe_UMR_flakey.txt
===================================================================
--- base/data/purify/base_unittests.exe_UMR_flakey.txt	(revision 29170)
+++ base/data/purify/base_unittests.exe_UMR_flakey.txt	(working copy)
@@ -12,3 +12,21 @@
    testing/gtest/src/gtest.cc  testing::Test::Run(void)
    ^^^  
 
+Uninitialized memory read in base::PrivateKeyInfoCodec::PrependIntegerImpl(BYTE *,int,list<BYTE,allocator<BYTE>::std>::std *,bool)
+Error Location
+   base/crypto/rsa_private_key.cc  base::PrivateKeyInfoCodec::PrependIntegerImpl(BYTE *,int,list::std *,bool)
+   base/crypto/rsa_private_key.cc  base::PrivateKeyInfoCodec::PrependInteger(vector::std const&,list::std *)
+   base/crypto/rsa_private_key.cc  base::PrivateKeyInfoCodec::Export(vector::std *)
+   base/crypto/rsa_private_key_win.cc  base::RSAPrivateKey::ExportPrivateKey(vector::std *)
+   base/crypto/rsa_private_key_unittest.cc  RSAPrivateKeyUnitTest_InitRandomTest_Test::TestBody(void)
+   testing/gtest/src/gtest.cc  testing::Test::Run(void)
+   ^^^  
+Alloc Location
+   ...  
+   base/crypto/rsa_private_key.cc  base::PrivateKeyInfoCodec::PrependIntegerImpl(BYTE *,int,list::std *,bool)
+   base/crypto/rsa_private_key.cc  base::PrivateKeyInfoCodec::PrependInteger(vector::std const&,list::std *)
+   base/crypto/rsa_private_key.cc  base::PrivateKeyInfoCodec::Export(vector::std *)
+   base/crypto/rsa_private_key_win.cc  base::RSAPrivateKey::ExportPrivateKey(vector::std *)
+   base/crypto/rsa_private_key_unittest.cc  RSAPrivateKeyUnitTest_InitRandomTest_Test::TestBody(void)
+   testing/gtest/src/gtest.cc  testing::Test::Run(void)
+   ^^^