Small cleanup (#29125)

The std::moves of temporaries prevented copy elision, and the functions
were unused (one with a TODO to re-enable later)

examples/cpp/route_guide/route_guide_callback_client.cc

@@ -138,7 +138,7 @@ class RouteGuideClient {
       bool done_ = false;
     };
     Reader reader(stub_.get(), kCoordFactor_, rect);
-    Status status = std::move(reader.Await());
+    Status status = reader.Await();
     if (status.ok()) {
       std::cout << "ListFeatures rpc succeeded." << std::endl;
     } else {
@@ -217,7 +217,7 @@ class RouteGuideClient {
     };
     Recorder recorder(stub_.get(), kCoordFactor_, &feature_list_);
     RouteSummary stats;
-    Status status = std::move(recorder.Await(&stats));
+    Status status = recorder.Await(&stats);
     if (status.ok()) {
       std::cout << "Finished trip with " << stats.point_count() << " points\n"
                 << "Passed " << stats.feature_count() << " features\n"
@@ -288,7 +288,7 @@ class RouteGuideClient {
     };
 
     Chatter chatter(stub_.get());
-    Status status = std::move(chatter.Await());
+    Status status = chatter.Await();
     if (!status.ok()) {
       std::cout << "RouteChat rpc failed." << std::endl;
     }

test/cpp/end2end/channelz_service_test.cc

@@ -139,12 +139,6 @@ std::string ReadFile(const char* file_path) {
   return file_contents;
 }
 
-grpc_core::PemKeyCertPairList ReadTlsIdentityPair(const char* key_path,
-                                                  const char* cert_path) {
-  return grpc_core::PemKeyCertPairList{
-      grpc_core::PemKeyCertPair(ReadFile(key_path), ReadFile(cert_path))};
-}
-
 std::shared_ptr<grpc::ChannelCredentials> GetChannelCredentials(
     CredentialsType type, ChannelArguments* args) {
   if (type == CredentialsType::kInsecure) {