message: Remove unnecessary using declaration.
  Ref
diff: @@ -33,8 +33,6 @@ using verible::file::CreateDir;
  using verible::file::JoinPath;
  using verible::file::testing::ScopedTestFile;
  -using ::testing::ElementsAre;
  -
  class TempDirFile : public ScopedTestFile {
  public:
  TempDirFile(absl::string_view content)
  