Make FuzzedDataProvider vend std::strings

net/websockets/websocket_frame_parser_fuzzer.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/test/fuzzed_data_provider.h"
 #include "net/websockets/websocket_frame_parser.h"
 
 // Entry point for LibFuzzer.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   base::FuzzedDataProvider fuzzed_data_provider(data, size);
   net::WebSocketFrameParser parser;
   std::vector<std::unique_ptr<net::WebSocketFrameChunk>> frame_chunks;
   while (fuzzed_data_provider.remaining_bytes() > 0) {
     size_t chunk_size = fuzzed_data_provider.ConsumeUint32InRange(1, 32);
-    base::StringPiece chunk = fuzzed_data_provider.ConsumeBytes(chunk_size);
+    std::string chunk = fuzzed_data_provider.ConsumeBytes(chunk_size);
     parser.Decode(chunk.data(), chunk.size(), &frame_chunks);
   }
   return 0;
 }