Update GURL accessors to prepare for crbug.com/448174617.

This also updates some code to avoid allocations in the future.
Note: this CL was written to avoid needing any changes to
the internal googleurl for simplicity.

Future changes to GURL relevant to this CL:
- path() and friends will return string_view
- path_piece() and friends will be removed
- We are adding GetPath() and friends to return std::strings

Protected by no behavior change.

PiperOrigin-RevId: 813827458

quiche/quic/tools/quic_url.cc

diff --git a/quiche/quic/tools/quic_url.cc b/quiche/quic/tools/quic_url.cc
index 7eaa8c0..de026ef 100644
--- a/quiche/quic/tools/quic_url.cc
+++ b/quiche/quic/tools/quic_url.cc
@@ -48,12 +48,11 @@
     return "";
   }
 
-  std::string host = url_.host();
   int port = url_.IntPort();
   if (port == url::PORT_UNSPECIFIED) {
-    return host;
+    return std::string(url_.host());
   }
-  return absl::StrCat(host, ":", port);
+  return absl::StrCat(url_.host(), ":", port);
 }
 
 std::string QuicUrl::PathParamsQuery() const {
@@ -69,7 +68,7 @@
     return "";
   }
 
-  return url_.scheme();
+  return std::string(url_.scheme());
 }
 
 std::string QuicUrl::host() const {
@@ -85,7 +84,7 @@
     return "";
   }
 
-  return url_.path();
+  return std::string(url_.path());
 }
 
 uint16_t QuicUrl::port() const {

quiche/quic/tools/web_transport_test_server.cc

diff --git a/quiche/quic/tools/web_transport_test_server.cc b/quiche/quic/tools/web_transport_test_server.cc
index 7c27156..c1f0707 100644
--- a/quiche/quic/tools/web_transport_test_server.cc
+++ b/quiche/quic/tools/web_transport_test_server.cc
@@ -44,7 +44,7 @@
     int count = 1;
     DeviousBatonValue initial_value =
         quiche::QuicheRandom::GetInstance()->RandUint64() % 256;
-    std::string query = url.query();
+    std::string query = std::string(url.query());
     url::Component query_component, key_component, value_component;
     query_component.begin = 0;
     query_component.len = query.size();