Revert of QUIC - instrumentation for testing null QuicSpdyStream.

net/quic/quic_http_stream.cc

Index: net/quic/quic_http_stream.cc
diff --git a/net/quic/quic_http_stream.cc b/net/quic/quic_http_stream.cc
index 398c96e05086a8aa6f9bf1550a2e3e8b383f3aeb..11cbf280669225cc76420cb1a7ad79990441060a 100644
--- a/net/quic/quic_http_stream.cc
+++ b/net/quic/quic_http_stream.cc
@@ -697,21 +697,7 @@ int QuicHttpStream::ProcessResponseHeaders(const SpdyHeaderBlock& headers) {
 }
 
 int QuicHttpStream::ReadAvailableData(IOBuffer* buf, int buf_len) {
-  // TODO(rtenneti): Temporary until crbug.com/585591 is solved.
-  CHECK(!read_in_progress_);
-  read_in_progress_ = true;
-  stream_->CrashIfInvalid();
-  stream_->set_read_in_progress(read_in_progress_);
-
   int rv = stream_->Read(buf, buf_len);
-  // TODO(rtenneti): Temporary until crbug.com/585591 is solved.
-  CHECK(read_in_progress_);
-  read_in_progress_ = false;
-  stream_->set_read_in_progress(read_in_progress_);
-  // CrashIfInvalid() may not be necessary. See if |stream_| became a nullptr
-  // due to memory corruptions.
-  stream_->CrashIfInvalid();
-
   if (stream_->IsDoneReading()) {
     stream_->SetDelegate(nullptr);
     stream_->OnFinRead();
@@ -721,11 +707,6 @@ int QuicHttpStream::ReadAvailableData(IOBuffer* buf, int buf_len) {
 }
 
 void QuicHttpStream::ResetStream() {
-  // TODO(rtenneti): Temporary until crbug.com/585591 is solved.
-  if (read_in_progress_) {
-    // |stream_| is going away when Read is called. Should never happen??
-    CHECK(false);
-  }
   if (push_handle_) {
     push_handle_->Cancel();
     push_handle_ = nullptr;