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

components/variations/net/variations_http_headers.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/variations/net/variations_http_headers.h"
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "base/strings/string_util.h"
@@ skipping 26 matching lines @@
 };
 
 const char kChromeUMAEnabled[] = "X-Chrome-UMA-Enabled";
 const char kClientData[] = "X-Client-Data";
 
 }  // namespace
 
 void AppendVariationHeaders(const GURL& url,
                             bool incognito,
                             bool uma_enabled,
-                            bool is_signed_in,
                             net::HttpRequestHeaders* headers) {
   // Note the criteria for attaching client experiment headers:
   // 1. We only transmit to Google owned domains which can evaluate experiments.
   //    1a. These include hosts which have a standard postfix such as:
   //         *.doubleclick.net or *.googlesyndication.com or
   //         exactly www.googleadservices.com or
   //         international TLD domains *.google.<TLD> or *.youtube.<TLD>.
   // 2. Only transmit for non-Incognito profiles.
   // 3. For the X-Chrome-UMA-Enabled bit, only set it if UMA is in fact enabled
   //    for this install of Chrome.
   // 4. For the X-Client-Data header, only include non-empty variation IDs.
   if (incognito || !internal::ShouldAppendVariationHeaders(url))
     return;
 
   if (uma_enabled)
     headers->SetHeaderIfMissing(kChromeUMAEnabled, "1");
 
   const std::string variation_ids_header =
-      VariationsHttpHeaderProvider::GetInstance()->GetClientDataHeader(
-          is_signed_in);
+      VariationsHttpHeaderProvider::GetInstance()->GetClientDataHeader();
   if (!variation_ids_header.empty()) {
     // Note that prior to M33 this header was named X-Chrome-Variations.
     headers->SetHeaderIfMissing(kClientData, variation_ids_header);
   }
 }
 
 std::set<std::string> GetVariationHeaderNames() {
   std::set<std::string> headers;
   headers.insert(kChromeUMAEnabled);
   headers.insert(kClientData);
@@ skipping 25 matching lines @@
       return true;
   }
 
   return google_util::IsYoutubeDomainUrl(url, google_util::ALLOW_SUBDOMAIN,
                                          google_util::ALLOW_NON_STANDARD_PORTS);
 }
 
 }  // namespace internal
 
 }  // namespace variations