Use string(StringPiece) instead of StringPiece::as_string().

net/spdy/spdy_deframer_visitor.cc

Index: net/spdy/spdy_deframer_visitor.cc
diff --git a/net/spdy/spdy_deframer_visitor.cc b/net/spdy/spdy_deframer_visitor.cc
index f5ebc21e99d9c808240b3e64a5b669c56cc767c8..2131edaedcc0dc4a790d853a0b43dfffc480a7be 100644
--- a/net/spdy/spdy_deframer_visitor.cc
+++ b/net/spdy/spdy_deframer_visitor.cc
@@ -420,7 +420,7 @@ void SpdyTestDeframerImpl::OnAltSvc(
                                << Http2FrameTypeToString(frame_type_);
   CHECK_GT(stream_id, 0u);
   auto ptr = MakeUnique<SpdyAltSvcIR>(stream_id);
-  ptr->set_origin(origin.as_string());
+  ptr->set_origin(std::string(origin));
   for (auto& altsvc : altsvc_vector) {
     ptr->add_altsvc(altsvc);
   }
@@ -761,7 +761,7 @@ void SpdyTestDeframerImpl::OnHeader(StringPiece key, StringPiece value) {
       << "   frame_type_=" << Http2FrameTypeToString(frame_type_);
   CHECK(!got_hpack_end_);
   CHECK(headers_);
-  headers_->emplace_back(key.as_string(), value.as_string());
+  headers_->emplace_back(std::string(key), std::string(value));
   CHECK(headers_handler_);
   headers_handler_->OnHeader(key, value);
 }