Convert remaining StringToLowerASCII to ToLowerASCII

crypto/symmetric_key_unittest.cc

Index: crypto/symmetric_key_unittest.cc
diff --git a/crypto/symmetric_key_unittest.cc b/crypto/symmetric_key_unittest.cc
index 28e44d27da7acb0bc83429238bd6ac31699a431d..ef8e7e1852acd81633eadc1898754213f0d73029 100644
--- a/crypto/symmetric_key_unittest.cc
+++ b/crypto/symmetric_key_unittest.cc
@@ -100,7 +100,7 @@ TEST_P(SymmetricKeyDeriveKeyFromPasswordTest, DeriveKeyFromPassword) {
   key->GetRawKey(&raw_key);
   EXPECT_EQ(test_data.key_size_in_bits / 8, raw_key.size());
   EXPECT_EQ(test_data.expected,
-            base::StringToLowerASCII(base::HexEncode(raw_key.data(),
+            base::ToLowerASCII(base::HexEncode(raw_key.data(),
                                                raw_key.size())));
 }