Revert 239759 "The comment in base64.h implies that base::Base64..."

trunk/src/chrome/browser/metrics/variations/variations_http_header_provider.cc

 // Copyright (c) 2012 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 "chrome/browser/metrics/variations/variations_http_header_provider.h"
 
 #include <vector>
 
 #include "base/base64.h"
 #include "base/memory/singleton.h"
@@ skipping 145 matching lines @@
   metrics::ChromeVariations proto;
   for (std::set<VariationID>::const_iterator it = all_variation_ids_set.begin();
        it != all_variation_ids_set.end(); ++it) {
     proto.add_variation_id(*it);
   }
 
   std::string serialized;
   proto.SerializeToString(&serialized);
 
   std::string hashed;
-  base::Base64Encode(serialized, &hashed);
-  // If successful, swap the header value with the new one.
-  // Note that the list of IDs and the header could be temporarily out of sync
-  // if IDs are added as the header is recreated. The receiving servers are OK
-  // with such discrepancies.
-  variation_ids_header_ = hashed;
+  if (base::Base64Encode(serialized, &hashed)) {
+    // If successful, swap the header value with the new one.
+    // Note that the list of IDs and the header could be temporarily out of sync
+    // if IDs are added as the header is recreated. The receiving servers are OK
+    // with such discrepancies.
+    variation_ids_header_ = hashed;
+  } else {
+    NOTREACHED() << "Failed to base64 encode Variation IDs value: "
+                 << serialized;
+  }
 }
 
 // static
 bool VariationsHttpHeaderProvider::ShouldAppendHeaders(const GURL& url) {
   if (google_util::IsGoogleDomainUrl(url, google_util::ALLOW_SUBDOMAIN,
                                      google_util::ALLOW_NON_STANDARD_PORTS)) {
     return true;
   }
 
   // The below mirrors logic in IsGoogleDomainUrl(), but for youtube.<TLD>.
   if (!url.is_valid() || !url.SchemeIsHTTPOrHTTPS())
     return false;
 
   const std::string host = url.host();
   const size_t tld_length = net::registry_controlled_domains::GetRegistryLength(
       host,
       net::registry_controlled_domains::EXCLUDE_UNKNOWN_REGISTRIES,
       net::registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES);
   if ((tld_length == 0) || (tld_length == std::string::npos))
     return false;
 
   const std::string host_minus_tld(host, 0, host.length() - tld_length);
   return LowerCaseEqualsASCII(host_minus_tld, "youtube.") ||
       EndsWith(host_minus_tld, ".youtube.", false);
 }
 
 }  // namespace chrome_variations