Replace llvm::error_code with std::error_code.

llvm-svn: 210780
diff --git a/clang/lib/Tooling/JSONCompilationDatabase.cpp b/clang/lib/Tooling/JSONCompilationDatabase.cpp
index 256b49c..d99d787 100644
--- a/clang/lib/Tooling/JSONCompilationDatabase.cpp
+++ b/clang/lib/Tooling/JSONCompilationDatabase.cpp
@@ -145,8 +145,8 @@
 JSONCompilationDatabase::loadFromFile(StringRef FilePath,
                                       std::string &ErrorMessage) {
   std::unique_ptr<llvm::MemoryBuffer> DatabaseBuffer;
-  llvm::error_code Result =
-    llvm::MemoryBuffer::getFile(FilePath, DatabaseBuffer);
+  std::error_code Result =
+      llvm::MemoryBuffer::getFile(FilePath, DatabaseBuffer);
   if (Result) {
     ErrorMessage = "Error while opening JSON database: " + Result.message();
     return nullptr;