[webcrypto] Remove the TODO for NullKey().

content/renderer/webcrypto/webcrypto_impl_unittest.cc

 // Copyright 2013 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 "webcrypto_impl.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 96 matching lines @@
     bool extractable = true;
     EXPECT_TRUE(crypto_.ImportKeyInternal(WebKit::WebCryptoKeyFormatRaw,
                                           Start(key_raw),
                                           key_raw.size(),
                                           algorithm,
                                           extractable,
                                           usage,
                                           &key));
 
     EXPECT_EQ(WebKit::WebCryptoKeyTypeSecret, key.type());
+    EXPECT_FALSE(key.isNull());
     EXPECT_TRUE(key.handle());
     return key;
   }
 
   // Forwarding methods to gain access to protected methods of
   // WebCryptoImpl.
 
   bool DigestInternal(
       const WebKit::WebCryptoAlgorithm& algorithm,
       const std::vector<uint8>& data,
@@ skipping 524 matching lines @@
   WebKit::WebCryptoKey key = WebKit::WebCryptoKey::createNull();
   EXPECT_FALSE(GenerateKeyInternal(CreateAesCbcAlgorithm(0), &key));
   EXPECT_FALSE(GenerateKeyInternal(CreateAesCbcAlgorithm(129), &key));
 }
 
 TEST_F(WebCryptoImplTest, GenerateKeyHmac) {
   WebKit::WebCryptoKey key = WebKit::WebCryptoKey::createNull();
   WebKit::WebCryptoAlgorithm algorithm =
       CreateHmacKeyAlgorithm(WebKit::WebCryptoAlgorithmIdSha1, 128);
   ASSERT_TRUE(GenerateKeyInternal(algorithm, &key));
+  EXPECT_FALSE(key.isNull());
   EXPECT_TRUE(key.handle());
   EXPECT_EQ(WebKit::WebCryptoKeyTypeSecret, key.type());
 }
 
 TEST_F(WebCryptoImplTest, GenerateKeyHmacNoLength) {
   WebKit::WebCryptoKey key = WebKit::WebCryptoKey::createNull();
   WebKit::WebCryptoAlgorithm algorithm =
       CreateHmacKeyAlgorithm(WebKit::WebCryptoAlgorithmIdSha1, 0);
   ASSERT_TRUE(GenerateKeyInternal(algorithm, &key));
   EXPECT_TRUE(key.handle());
@@ skipping 115 matching lines @@
   EXPECT_EQ(WebKit::WebCryptoKeyTypePrivate, private_key.type());
   EXPECT_EQ(extractable, public_key.extractable());
   EXPECT_EQ(extractable, private_key.extractable());
   EXPECT_EQ(usage_mask, public_key.usages());
   EXPECT_EQ(usage_mask, private_key.usages());
 }
 
 #endif  // #if !defined(USE_OPENSSL)
 
 }  // namespace content