Async DNS: Disable on Linux until we parse nsswitch.conf

chrome/browser/net/async_dns_field_trial.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/net/async_dns_field_trial.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
 #include "build/build_config.h"
@@ skipping 49 matching lines @@
 
 }  // namespace
 
 bool ConfigureAsyncDnsFieldTrial() {
 #if defined(OS_ANDROID) || defined(OS_IOS)
   // There is no DnsConfigService on those platforms so disable the field trial.
   HistogramPrefDefaultSource(PLATFORM, false);
   return false;
 #endif
 
-#if defined(OS_CHROMEOS) || defined(OS_LINUX) || defined(OS_MACOSX)
+#if defined(OS_CHROMEOS) || defined(OS_MACOSX)
   const bool kDefault = true;
 #else
   const bool kDefault = false;
 #endif
 
   // Configure the AsyncDns field trial as follows:
   // groups AsyncDnsA and AsyncDnsB: return true,
   // groups SystemDnsA and SystemDnsB: return false,
   // otherwise (trial absent): return default.
   std::string group_name = base::FieldTrialList::FindFullName("AsyncDns");
@@ skipping 23 matching lines @@
     HistogramPrefSource(EXTENSION_PREF, enabled);
   else if (pref->IsUserControlled())
     HistogramPrefSource(USER_PREF, enabled);
   else if (pref->IsDefaultValue())
     HistogramPrefSource(DEFAULT_PREF, enabled);
   else
     HistogramPrefSource(UNKNOWN_PREF, enabled);
 }
 
 }  // namespace chrome_browser_net