Change HostResolver::Resolve() to take an std::unique_ptr<Request>* rather than a RequestHandle*

net/dns/host_resolver.cc

Index: net/dns/host_resolver.cc
diff --git a/net/dns/host_resolver.cc b/net/dns/host_resolver.cc
index be393b047e433495cd453cbe02c6c7bb55bbfcb9..b4283a779bf19f1f8442e4bac025083e3d7c8566 100644
--- a/net/dns/host_resolver.cc
+++ b/net/dns/host_resolver.cc
@@ -104,11 +104,6 @@ HostResolver::~HostResolver() {
 void HostResolver::SetDnsClientEnabled(bool enabled) {
 }
 
-void HostResolver::ChangeRequestPriority(RequestHandle req,
-                                         RequestPriority priority) {
-  NOTIMPLEMENTED();
-}
-
 HostCache* HostResolver::GetHostCache() {
   return nullptr;
 }