[clang-format] Remove unused using directive, NFC

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@303742 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/Format/FormatTestObjC.cpp

@@ -20,7 +20,6 @@
 #define DEBUG_TYPE "format-test"
 
 using clang::tooling::ReplacementTest;
-using clang::tooling::toReplacements;
 
 namespace clang {
 namespace format {