Reland "Change ProxyResolver::GetProxyForURL() to take a unique_ptr<Request>* "

net/proxy/proxy_resolver_mac.cc

Index: net/proxy/proxy_resolver_mac.cc
diff --git a/net/proxy/proxy_resolver_mac.cc b/net/proxy/proxy_resolver_mac.cc
index fa1de89858a497a0e7de98759a5ef35f2c3ed7c2..421692e87721e0146e13622535defc3b99649c8a 100644
--- a/net/proxy/proxy_resolver_mac.cc
+++ b/net/proxy/proxy_resolver_mac.cc
@@ -191,13 +191,9 @@ class ProxyResolverMac : public ProxyResolver {
   int GetProxyForURL(const GURL& url,
                      ProxyInfo* results,
                      const CompletionCallback& callback,
-                     RequestHandle* request,
+                     std::unique_ptr<Request>* request,
                      const NetLogWithSource& net_log) override;
 
-  void CancelRequest(RequestHandle request) override;
-
-  LoadState GetLoadState(RequestHandle request) const override;
-
  private:
   const scoped_refptr<ProxyResolverScriptData> script_data_;
 };
@@ -214,7 +210,7 @@ ProxyResolverMac::~ProxyResolverMac() {}
 int ProxyResolverMac::GetProxyForURL(const GURL& query_url,
                                      ProxyInfo* results,
                                      const CompletionCallback& /*callback*/,
-                                     RequestHandle* /*request*/,
+                                     std::unique_ptr<Request>* /*request*/,
                                      const NetLogWithSource& net_log) {
   base::ScopedCFTypeRef<CFStringRef> query_ref(
       base::SysUTF8ToCFStringRef(query_url.spec()));
@@ -342,15 +338,6 @@ int ProxyResolverMac::GetProxyForURL(const GURL& query_url,
   return OK;
 }
 
-void ProxyResolverMac::CancelRequest(RequestHandle request) {
-  NOTREACHED();
-}
-
-LoadState ProxyResolverMac::GetLoadState(RequestHandle request) const {
-  NOTREACHED();
-  return LOAD_STATE_IDLE;
-}
-
 }  // namespace
 
 ProxyResolverFactoryMac::ProxyResolverFactoryMac()