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/MemoryBufferTest.cpp b/llvm/unittests/Support/MemoryBufferTest.cpp
index 7802537..98af5c4 100644
--- a/llvm/unittests/Support/MemoryBufferTest.cpp
+++ b/llvm/unittests/Support/MemoryBufferTest.cpp
@@ -17,7 +17,6 @@
 #include "gtest/gtest.h"
 
 using namespace llvm;
-using std::error_code;
 
 namespace {
 
@@ -79,7 +78,7 @@
   OF.close();
 
   OwningBuffer MB;
-  error_code EC = MemoryBuffer::getFile(TestPath.c_str(), MB);
+  std::error_code EC = MemoryBuffer::getFile(TestPath.c_str(), MB);
   ASSERT_FALSE(EC);
 
   const char *BufData = MB->getBufferStart();
@@ -148,10 +147,11 @@
   }
 
   OwningBuffer Buf;
-  error_code EC = MemoryBuffer::getOpenFileSlice(TestFD, TestPath.c_str(), Buf,
-                                                 40000, // Size
-                                                 80000  // Offset
-                                                 );
+  std::error_code EC =
+      MemoryBuffer::getOpenFileSlice(TestFD, TestPath.c_str(), Buf,
+                                     40000, // Size
+                                     80000  // Offset
+                                     );
   EXPECT_FALSE(EC);
 
   StringRef BufData = Buf->getBuffer();