GTTF: Convert most tests in content to use EmbeddedTestServer.

net/test/embedded_test_server/http_response.cc

Index: net/test/embedded_test_server/http_response.cc
diff --git a/net/test/embedded_test_server/http_response.cc b/net/test/embedded_test_server/http_response.cc
index 2c05c0632a0225c45ab656ed902e83862d296192..411574b7932c51e550d5d62aa096c6cd833f0ed3 100644
--- a/net/test/embedded_test_server/http_response.cc
+++ b/net/test/embedded_test_server/http_response.cc
@@ -11,13 +11,16 @@
 namespace net {
 namespace test_server {
 
-HttpResponse::HttpResponse() : code_(SUCCESS) {
+HttpResponse::~HttpResponse() {
 }
 
-HttpResponse::~HttpResponse() {
+HttpResponseImpl::HttpResponseImpl() : code_(SUCCESS) {
+}
+
+HttpResponseImpl::~HttpResponseImpl() {
 }
 
-std::string HttpResponse::ToResponseString() const {
+std::string HttpResponseImpl::ToResponseString() const {
   // Response line with headers.
   std::string response_builder;