Fix unused-typedef issue in mcrouter/routes/test/RouteHandleTestUtil.h +1

Summary:
LLVM has a warning `-Wunused-local-typedef` which we treat as an error because it identifies unused code which can cause otherwise unused includes to unnecessarily persist leading to longer build times.

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Reviewed By: dtolnay

Differential Revision: D77413733

fbshipit-source-id: d481f640af5df3b5602f8a7966fbb629122f511a

Author: r-barnes

third-party/mcrouter/src/mcrouter/routes/test/RouteHandleTestUtil.h

@@ -61,7 +61,6 @@ inline void mockFiberContext() {
 template <class RouterInfo = McrouterRouterInfo>
 void setRecordBucketDataContext(
     std::vector<std::pair<std::string, std::string>>& pairs) {
-  using KeyBucketPair = std::pair<std::string, std::string>;
   auto cb = [&pairs](
                 std::string key,
                 const uint64_t bucket,