Revert of Avoids the "re-encode HPACK as SPDY3" step.

net/spdy/spdy_test_util_common.cc

Index: net/spdy/spdy_test_util_common.cc
diff --git a/net/spdy/spdy_test_util_common.cc b/net/spdy/spdy_test_util_common.cc
index 53434d609983e0ade2643be242dc753d7a838a9f..92c9c58675735a9a11bbf2873588ceae69c42c98 100644
--- a/net/spdy/spdy_test_util_common.cc
+++ b/net/spdy/spdy_test_util_common.cc
@@ -216,6 +216,11 @@
                          size_t len) override {}
   void OnStreamEnd(SpdyStreamId stream_id) override {}
   void OnStreamPadding(SpdyStreamId stream_id, size_t len) override {}
+  SpdyHeadersHandlerInterface* OnHeaderFrameStart(
+      SpdyStreamId stream_id) override {
+    return nullptr;
+  }
+  void OnHeaderFrameEnd(SpdyStreamId stream_id, bool end_headers) override {}
   void OnSettings(bool clear_persisted) override {}
   void OnSetting(SpdySettingsIds id, uint8_t flags, uint32_t value) override {}
   void OnPing(SpdyPingId unique_id, bool is_ack) override {}