Do not call GetHttpReasonPhrase

https://crrev.com/c/5371447 introduced calling ::net::GetHttpReasonPhrase to map a `response_code` to a string.

However, when no network is present, `response_code` is 0 and ::net::GetHttpReasonPhrase runs into `NOT_REACHED`, which crashes chrome on non-official builds.

Since this mapping seems mostly for convenience, this CL proposed to remove it. Please let me know if you prefer to fix it differently.

Bug: b:333365281
Change-Id: Ife03b30c33bb44d6c18b33302b345647a92c8517
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5434994
Reviewed-by: Alberto Juarez <albertojuarez@google.com>
Commit-Queue: Alberto Juarez <albertojuarez@google.com>
Reviewed-by: Steffen Seckler <sseckler@google.com>
Cr-Commit-Position: refs/heads/main@{#1285940}
diff --git a/chrome/browser/policy/messaging_layer/upload/encrypted_reporting_client.cc b/chrome/browser/policy/messaging_layer/upload/encrypted_reporting_client.cc
index 8ba16a77..03df746 100644
--- a/chrome/browser/policy/messaging_layer/upload/encrypted_reporting_client.cc
+++ b/chrome/browser/policy/messaging_layer/upload/encrypted_reporting_client.cc
@@ -651,9 +651,7 @@
     std::move(callback).Run(base::unexpected(
         Status(error::DATA_LOSS,
                base::StrCat(
-                   {"Response code: ", base::NumberToString(response_code), " ",
-                    ::net::GetHttpReasonPhrase(
-                        static_cast<::net::HttpStatusCode>(response_code))}))));
+                   {"Response code: ", base::NumberToString(response_code)}))));
     return;
   }
   if (!response.has_value()) {