GTTF: Convert most tests in content to use EmbeddedTestServer.

net/test/embedded_test_server/http_connection.h

Index: net/test/embedded_test_server/http_connection.h
diff --git a/net/test/embedded_test_server/http_connection.h b/net/test/embedded_test_server/http_connection.h
index da9353404c6c840498ba9713707c07b8f2f2bdae..1477a2d6a9289ccf9edd555217e106566f91ba7a 100644
--- a/net/test/embedded_test_server/http_connection.h
+++ b/net/test/embedded_test_server/http_connection.h
@@ -18,7 +18,7 @@ class StreamListenSocket;
 namespace test_server {
 
 class HttpConnection;
-class HttpResponse;
+class HttpResponseInterface;
 
 // Calblack called when a request is parsed. Response should be sent
 // using HttpConnection::SendResponse() on the |connection| argument.
@@ -35,7 +35,7 @@ class HttpConnection {
   ~HttpConnection();
 
   // Sends the HTTP response to the client.
-  void SendResponse(scoped_ptr<HttpResponse> response) const;
+  void SendResponse(scoped_ptr<HttpResponseInterface> response) const;
 
  private:
   friend class EmbeddedTestServer;