Revert 64202 - Initial support for built-in DNS resolver/cache....

net/base/host_resolver.h

Index: net/base/host_resolver.h
===================================================================
--- net/base/host_resolver.h	(revision 64203)
+++ net/base/host_resolver.h	(working copy)
@@ -20,7 +20,6 @@
 class AddressList;
 class BoundNetLog;
 class HostResolverImpl;
-class HostResolverProc;
 class NetLog;
 
 // This class represents the task of resolving hostnames (or IP address
@@ -231,13 +230,13 @@
   DISALLOW_COPY_AND_ASSIGN(SingleRequestHostResolver);
 };
 
-// Creates a HostResolver implementation using |resolver_proc| as resolver,
-// (which if NULL, will default to getaddrinfo() wrapper) that queries the
-// underlying system, |max_concurrent_resolves| is how many resolve
-// requests will be allowed to run in parallel. Pass
-// HostResolver::kDefaultParallelism to choose a default value.
+// Creates a HostResolver implementation that queries the underlying system.
+// (Except if a unit-test has changed the global HostResolverProc using
+// ScopedHostResolverProc to intercept requests to the system).
+// |max_concurrent_resolves| is how many resolve requests will be allowed to
+// run in parallel. Pass HostResolver::kDefaultParallelism to choose a
+// default value.
 HostResolver* CreateSystemHostResolver(size_t max_concurrent_resolves,
-                                       HostResolverProc* resolver_proc,
                                        NetLog* net_log);
 
 }  // namespace net