ResourceLoader: Fix a bunch of double-cancellation/double-error notification cases.

net/url_request/url_request_test_util.h

Index: net/url_request/url_request_test_util.h
diff --git a/net/url_request/url_request_test_util.h b/net/url_request/url_request_test_util.h
index 6a023ed2e7d7940759d13ebbd40774a2a0caf10e..3a90f5f70d72ab0feceec6543058e4020773ffdc 100644
--- a/net/url_request/url_request_test_util.h
+++ b/net/url_request/url_request_test_util.h
@@ -165,6 +165,7 @@ class TestDelegate : public URLRequest::Delegate {
   const std::string& data_received() const { return data_received_; }
   int bytes_received() const { return static_cast<int>(data_received_.size()); }
   int response_started_count() const { return response_started_count_; }
+  int received_bytes_count() const { return received_bytes_count_; }
   int received_redirect_count() const { return received_redirect_count_; }
   bool received_data_before_response() const {
     return received_data_before_response_;