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

net/spdy/spdy_session.cc

Index: net/spdy/spdy_session.cc
diff --git a/net/spdy/spdy_session.cc b/net/spdy/spdy_session.cc
index 344b20cd30697e215d84558303796e3e4a2b8377..76b74a5e0bd1be6994e33f64246697706180aa83 100644
--- a/net/spdy/spdy_session.cc
+++ b/net/spdy/spdy_session.cc
@@ -362,8 +362,6 @@
       return SPDY_ERROR_INVALID_CONTROL_FRAME_FLAGS;
     case SpdyFramer::SPDY_UNEXPECTED_FRAME:
       return SPDY_ERROR_UNEXPECTED_FRAME;
-    case SpdyFramer::SPDY_INTERNAL_FRAMER_ERROR:
-      return SPDY_ERROR_INTERNAL_FRAMER_ERROR;
     case SpdyFramer::SPDY_INVALID_CONTROL_FRAME_SIZE:
       return SPDY_ERROR_INVALID_CONTROL_FRAME_SIZE;
     case SpdyFramer::SPDY_INVALID_STREAM_ID:
@@ -401,8 +399,6 @@
     case SpdyFramer::SPDY_INVALID_CONTROL_FRAME_FLAGS:
       return ERR_SPDY_PROTOCOL_ERROR;
     case SpdyFramer::SPDY_UNEXPECTED_FRAME:
-      return ERR_SPDY_PROTOCOL_ERROR;
-    case SpdyFramer::SPDY_INTERNAL_FRAMER_ERROR:
       return ERR_SPDY_PROTOCOL_ERROR;
     case SpdyFramer::SPDY_INVALID_CONTROL_FRAME_SIZE:
       return ERR_SPDY_FRAME_SIZE_ERROR;
@@ -2212,6 +2208,16 @@
   it->second.stream->OnPaddingConsumed(len);
 }
 
+SpdyHeadersHandlerInterface* SpdySession::OnHeaderFrameStart(
+    SpdyStreamId stream_id) {
+  LOG(FATAL);
+  return nullptr;
+}
+
+void SpdySession::OnHeaderFrameEnd(SpdyStreamId stream_id, bool end_headers) {
+  LOG(FATAL);
+}
+
 void SpdySession::OnSettings(bool clear_persisted) {
   CHECK(in_io_loop_);