GTTF: Convert most tests in content to use EmbeddedTestServer.

net/test/embedded_test_server/embedded_test_server.h

Index: net/test/embedded_test_server/embedded_test_server.h
diff --git a/net/test/embedded_test_server/embedded_test_server.h b/net/test/embedded_test_server/embedded_test_server.h
index 69662278b9923a8a74e29b64ebf802f3ca25bdce..66debeb49aa1c78c0c39d25335336ee21926c679 100644
--- a/net/test/embedded_test_server/embedded_test_server.h
+++ b/net/test/embedded_test_server/embedded_test_server.h
@@ -25,7 +25,7 @@ namespace net {
 namespace test_server {
 
 class HttpConnection;
-class HttpResponse;
+class HttpResponseInterface;
 struct HttpRequest;
 
 // This class is required to be able to have composition instead of inheritance,
@@ -77,8 +77,8 @@ class HttpListenSocket : public TCPListenSocket {
 //
 class EmbeddedTestServer : public StreamListenSocket::Delegate {
  public:
-  typedef base::Callback<scoped_ptr<HttpResponse>(const HttpRequest& request)>
-      HandleRequestCallback;
+  typedef base::Callback<scoped_ptr<HttpResponseInterface>(
+      const HttpRequest& request)> HandleRequestCallback;
 
   // Creates a http test server. |io_thread| is a task runner
   // with IO message loop, used as a backend thread.