Remove 'using std::errro_code' from lib.

llvm-svn: 210871
diff --git a/llvm/lib/Support/Unix/Program.inc b/llvm/lib/Support/Unix/Program.inc
index d850664..50f973a 100644
--- a/llvm/lib/Support/Unix/Program.inc
+++ b/llvm/lib/Support/Unix/Program.inc
@@ -48,7 +48,6 @@
 #endif
 
 namespace llvm {
-using std::error_code;
 
 using namespace sys;
 
@@ -427,14 +426,14 @@
   return WaitResult;
 }
 
-error_code sys::ChangeStdinToBinary(){
+  std::error_code sys::ChangeStdinToBinary(){
   // Do nothing, as Unix doesn't differentiate between text and binary.
-  return error_code();
+    return std::error_code();
 }
 
-error_code sys::ChangeStdoutToBinary(){
+  std::error_code sys::ChangeStdoutToBinary(){
   // Do nothing, as Unix doesn't differentiate between text and binary.
-  return error_code();
+    return std::error_code();
 }
 
 bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {