Revert of Restrict transmission of external exp ids to signed in users.

chrome/browser/safe_browsing/srt_fetcher_win.cc

Index: chrome/browser/safe_browsing/srt_fetcher_win.cc
diff --git a/chrome/browser/safe_browsing/srt_fetcher_win.cc b/chrome/browser/safe_browsing/srt_fetcher_win.cc
index 6b4a5e97ba6ebcae95d2c0ae25cdd3e6309cdf96..a7bd91a84dc746eea91ecdf8068ac6a2962d1e62 100644
--- a/chrome/browser/safe_browsing/srt_fetcher_win.cc
+++ b/chrome/browser/safe_browsing/srt_fetcher_win.cc
@@ -632,13 +632,10 @@
     ProfileIOData* io_data = ProfileIOData::FromResourceContext(
         profile_->GetResourceContext());
     net::HttpRequestHeaders headers;
-    // Note: It's fine to pass in |is_signed_in| false, which does not affect
-    // transmission of experiment ids coming from the variations server.
-    bool is_signed_in = false;
     variations::AppendVariationHeaders(
         url_fetcher_->GetOriginalURL(), io_data->IsOffTheRecord(),
         ChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled(),
-        is_signed_in, &headers);
+        &headers);
     url_fetcher_->SetExtraRequestHeaders(headers.ToString());
     url_fetcher_->Start();
   }