Address review comments

test/cpp/util/cli_credentials.h

@@ -42,7 +42,7 @@ namespace testing {
 
 class CliCredentials {
  public:
-  virtual ~CliCredentials(){};
+  virtual ~CliCredentials() {}
   virtual std::shared_ptr<grpc::ChannelCredentials> GetCredentials() const;
   virtual const grpc::string GetCredentialUsage() const;
 };

test/cpp/util/proto_file_parser.h

@@ -51,7 +51,7 @@ class ProtoFileParser {
   // The parser will search proto files using the server reflection service
   // provided on the given channel. The given protofiles in a source tree rooted
   // from proto_path will also be searched.
-  explicit ProtoFileParser(std::shared_ptr<grpc::Channel> channel,
+  ProtoFileParser(std::shared_ptr<grpc::Channel> channel,
                   const grpc::string& proto_path,
                   const grpc::string& protofiles);