Use base::ResetAndReturn() in remoting.

remoting/client/token_fetcher_proxy.cc

Index: remoting/client/token_fetcher_proxy.cc
diff --git a/remoting/client/token_fetcher_proxy.cc b/remoting/client/token_fetcher_proxy.cc
index c1082b2d427050621df7b1ba380dc8f384a221ef..10792907fcdcb20c61a51b08ab3415ba66602a88 100644
--- a/remoting/client/token_fetcher_proxy.cc
+++ b/remoting/client/token_fetcher_proxy.cc
@@ -4,6 +4,8 @@
 
 #include "remoting/client/token_fetcher_proxy.h"
 
+#include "base/callback_helpers.h"
+
 namespace remoting {
 
 TokenFetcherProxy::TokenFetcherProxy(
@@ -29,8 +31,7 @@ void TokenFetcherProxy::FetchThirdPartyToken(
 void TokenFetcherProxy::OnTokenFetched(
     const std::string& token, const std::string& shared_secret) {
   if (!token_fetched_callback_.is_null()) {
-    token_fetched_callback_.Run(token, shared_secret);
-    token_fetched_callback_.Reset();
+    base::ResetAndReturn(&token_fetched_callback_).Run(token, shared_secret);
   }
 }