Remove HpackDecoder2.

net/spdy/spdy_framer.cc

Index: net/spdy/spdy_framer.cc
diff --git a/net/spdy/spdy_framer.cc b/net/spdy/spdy_framer.cc
index c8471bf5905d905e9173eadd46233593d1cbe9d8..1483962b95b588228c88e65bb734c3a25cb00d5a 100644
--- a/net/spdy/spdy_framer.cc
+++ b/net/spdy/spdy_framer.cc
@@ -25,7 +25,6 @@
 #include "net/quic/core/quic_flags.h"
 #include "net/spdy/hpack/hpack_constants.h"
 #include "net/spdy/hpack/hpack_decoder.h"
-#include "net/spdy/hpack/hpack_decoder2.h"
 #include "net/spdy/hpack/hpack_decoder3.h"
 #include "net/spdy/http2_frame_decoder_adapter.h"
 #include "net/spdy/platform/api/spdy_estimate_memory_usage.h"
@@ -2403,11 +2402,7 @@ HpackEncoder* SpdyFramer::GetHpackEncoder() {
 HpackDecoderInterface* SpdyFramer::GetHpackDecoder() {
   if (hpack_decoder_.get() == nullptr) {
     if (FLAGS_chromium_http2_flag_spdy_use_hpack_decoder3) {
-      SPDY_BUG_IF(FLAGS_chromium_http2_flag_spdy_use_hpack_decoder2)
-          << "Both alternate decoders are enabled.";
       hpack_decoder_.reset(new HpackDecoder3());
-    } else if (FLAGS_chromium_http2_flag_spdy_use_hpack_decoder2) {
-      hpack_decoder_.reset(new HpackDecoder2());
     } else {
       hpack_decoder_.reset(new HpackDecoder());
     }