Reset HTTP/2 stream on line-folded response headers.

net/spdy/header_coalescer.cc

Index: net/spdy/header_coalescer.cc
diff --git a/net/spdy/header_coalescer.cc b/net/spdy/header_coalescer.cc
index 1c88fbab6a36a778c4b46e9ae115a583a8849aee..199fabf445cf8b9b239e223c1e054810f0b5e8fc 100644
--- a/net/spdy/header_coalescer.cc
+++ b/net/spdy/header_coalescer.cc
@@ -39,6 +39,13 @@ void HeaderCoalescer::OnHeader(base::StringPiece key, base::StringPiece value) {
     regular_header_seen_ = true;
   }
 
+  // End of line delimiter is forbidden according to RFC 7230 Section 3.2.
+  // Line folding, RFC 7230 Section 3.2.4., is a special case of this.
+  if (value.find("\r\n") != base::StringPiece::npos) {
+    error_seen_ = true;
+    return;
+  }
+
   auto iter = headers_.find(key);
   if (iter == headers_.end()) {
     headers_[key] = value;