spdy: DCHECK parameters should depend on DCHECK_IS_ON() macro.

net/spdy/hpack/hpack_huffman_decoder.cc

Index: net/spdy/hpack/hpack_huffman_decoder.cc
diff --git a/net/spdy/hpack/hpack_huffman_decoder.cc b/net/spdy/hpack/hpack_huffman_decoder.cc
index f305a664e074bb3a55509ce9a39184148d7efd4f..dcb512cb76a3c94e1b9f8812854242c3a88ba1d5 100644
--- a/net/spdy/hpack/hpack_huffman_decoder.cc
+++ b/net/spdy/hpack/hpack_huffman_decoder.cc
@@ -158,7 +158,7 @@ const uint8_t kCanonicalToSymbol[] = {
 };
 // clang-format on
 
-#if !defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)
+#if DCHECK_IS_ON()
 
 // Only used in DLOG.
 bool IsEOSPrefix(HuffmanWord bits, HuffmanCodeLength bits_available) {
@@ -171,7 +171,7 @@ bool IsEOSPrefix(HuffmanWord bits, HuffmanCodeLength bits_available) {
   return bits == expected;
 }
 
-#endif  // NDEBUG && !defined(DCHECK_ALWAYS_ON)
+#endif  // DCHECK_IS_ON()
 
 }  // namespace