Make FuzzedDataProvider vend std::strings

net/udp/fuzzed_datagram_client_socket.cc

Index: net/udp/fuzzed_datagram_client_socket.cc
diff --git a/net/udp/fuzzed_datagram_client_socket.cc b/net/udp/fuzzed_datagram_client_socket.cc
index 0f9eaef0a7fcf742891e2c6875a171ecca6e0a08..944da35e0bdedb783af24c95bccb6172379dc4a2 100644
--- a/net/udp/fuzzed_datagram_client_socket.cc
+++ b/net/udp/fuzzed_datagram_client_socket.cc
@@ -106,13 +106,13 @@ int FuzzedDatagramClientSocket::Read(IOBuffer* buf,
   CHECK(connected_);
 
   // Get contents of response.
-  base::StringPiece data(data_provider_->ConsumeBytes(
+  std::string data(data_provider_->ConsumeBytes(
       data_provider_->ConsumeUint32InRange(0, buf_len)));
 
   int result;
-  if (data.length() > 0) {
+  if (data.size() > 0) {
     // If the response is not empty, consider it a successful read.
-    result = data.length();
+    result = data.size();
     std::copy(data.begin(), data.end(), buf->data());
   } else {
     // If the response is empty, pick a random read error.