GTTF: Convert most tests in content to use EmbeddedTestServer.

net/test/embedded_test_server/embedded_test_server_unittest.cc

Index: net/test/embedded_test_server/embedded_test_server_unittest.cc
diff --git a/net/test/embedded_test_server/embedded_test_server_unittest.cc b/net/test/embedded_test_server/embedded_test_server_unittest.cc
index 1993ef0f931a746c7a409e4d9757b8e060ded560..950c8c4ceecdb4633899c6ec7f14edf763704a4f 100644
--- a/net/test/embedded_test_server/embedded_test_server_unittest.cc
+++ b/net/test/embedded_test_server/embedded_test_server_unittest.cc
@@ -91,11 +91,11 @@ class EmbeddedTestServerTest : public testing::Test,
 
     GURL absolute_url = server_->GetURL(request.relative_url);
     if (absolute_url.path() == path) {
-      scoped_ptr<HttpResponse> http_response(new HttpResponse);
+      scoped_ptr<HttpResponseImpl> http_response(new HttpResponseImpl);
       http_response->set_code(code);
       http_response->set_content(content);
       http_response->set_content_type(content_type);
-      return http_response.Pass();
+      return http_response.PassAs<HttpResponse>();
     }
 
     return scoped_ptr<HttpResponse>();