Remove the last uses of 'using std::error_code'

This finishes the transition to std::error_code.

llvm-svn: 210877
diff --git a/llvm/unittests/Support/LockFileManagerTest.cpp b/llvm/unittests/Support/LockFileManagerTest.cpp
index 3d6357c..885b7d6 100644
--- a/llvm/unittests/Support/LockFileManagerTest.cpp
+++ b/llvm/unittests/Support/LockFileManagerTest.cpp
@@ -14,13 +14,12 @@
 #include <memory>
 
 using namespace llvm;
-using std::error_code;
 
 namespace {
 
 TEST(LockFileManagerTest, Basic) {
   SmallString<64> TmpDir;
-  error_code EC;
+  std::error_code EC;
   EC = sys::fs::createUniqueDirectory("LockFileManagerTestDir", TmpDir);
   ASSERT_FALSE(EC);
 
@@ -47,7 +46,7 @@
 
 TEST(LockFileManagerTest, LinkLockExists) {
   SmallString<64> TmpDir;
-  error_code EC;
+  std::error_code EC;
   EC = sys::fs::createUniqueDirectory("LockFileManagerTestDir", TmpDir);
   ASSERT_FALSE(EC);
 
@@ -90,7 +89,7 @@
 
 TEST(LockFileManagerTest, RelativePath) {
   SmallString<64> TmpDir;
-  error_code EC;
+  std::error_code EC;
   EC = sys::fs::createUniqueDirectory("LockFileManagerTestDir", TmpDir);
   ASSERT_FALSE(EC);