[pp-trace] Remove unused using directives

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@342445 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/pp-trace/PPTrace.cpp b/pp-trace/PPTrace.cpp
index d49bc20..08e0f51 100644
--- a/pp-trace/PPTrace.cpp
+++ b/pp-trace/PPTrace.cpp
@@ -73,11 +73,8 @@
 #include <vector>
 
 using namespace clang;
-using namespace clang::driver;
-using namespace clang::driver::options;
 using namespace clang::tooling;
 using namespace llvm;
-using namespace llvm::opt;
 
 // Options: