Replace llvm::error_code with std::error_code.

llvm-svn: 210776
diff --git a/clang-tools-extra/clang-tidy/ClangTidyOptions.h b/clang-tools-extra/clang-tidy/ClangTidyOptions.h
index 7359d76..6234642 100644
--- a/clang-tools-extra/clang-tidy/ClangTidyOptions.h
+++ b/clang-tools-extra/clang-tidy/ClangTidyOptions.h
@@ -89,12 +89,12 @@
 };
 
 /// \brief Parses LineFilter from JSON and stores it to the \p Options.
-llvm::error_code parseLineFilter(const std::string &LineFilter,
-                                 clang::tidy::ClangTidyGlobalOptions &Options);
+std::error_code parseLineFilter(const std::string &LineFilter,
+                                clang::tidy::ClangTidyGlobalOptions &Options);
 
 /// \brief Parses configuration from JSON and stores it to the \p Options.
-llvm::error_code parseConfiguration(const std::string &Config,
-                                    clang::tidy::ClangTidyOptions &Options);
+std::error_code parseConfiguration(const std::string &Config,
+                                   clang::tidy::ClangTidyOptions &Options);
 
 } // end namespace tidy
 } // end namespace clang