Apply modernize-use-default to clang.

Summary: Replace empty bodies of default constructors and destructors with '= default'.

Reviewers: bkramer, klimek

Subscribers: klimek, alexfh, cfe-commits

Differential Revision: http://reviews.llvm.org/D13890

llvm-svn: 250822
diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index 634dbe9..2956f84 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -25,7 +25,7 @@
 
 class FormatTokenSource {
 public:
-  virtual ~FormatTokenSource() {}
+  virtual ~FormatTokenSource() = default;
   virtual FormatToken *getNextToken() = 0;
 
   virtual unsigned getPosition() = 0;