[net] HostResolverImpl + DnsTransaction + DnsConfigService = Asynchronous DNS ready for experiments.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 24262eb219ff15596bf4bba0786928839e51a6a6..d7607ba0107347972e02d91d06c8227ee65ac3bb 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -408,9 +408,6 @@ const char kDnsLogDetails[]                 = "dns-log-details";
 // Disables prefetching of DNS information.
 const char kDnsPrefetchDisable[]            = "dns-prefetch-disable";
 
-// Use the specified DNS server for raw DNS resolution.
-const char kDnsServer[]                     = "dns-server";
-
 // Replaces the download shelf with a new experimental UI.
 const char kDownloadsNewUI[]                = "downloads-new-ui";
 
@@ -422,6 +419,9 @@ const char kDumpHistogramsOnExit[]          = "dump-histograms-on-exit";
 // Enables AeroPeek for each tab. (This switch only works on Windows 7).
 const char kEnableAeroPeekTabs[]            = "enable-aero-peek-tabs";
 
+// Enables the experimental asynchronous DNS client.
+const char kEnableAsyncDns[]                = "enable-async-dns";
+
 // Enables the inclusion of non-standard ports when generating the Kerberos SPN
 // in response to a Negotiate challenge. See
 // HttpAuthHandlerNegotiate::CreateSPN for more background.