[NFC] Header cleanup

Summary: Removed unused headers, replaced some headers with forward class declarations

Patch by: Eugene <claprix@yandex.ru>

Differential Revision: https://reviews.llvm.org/D20100

llvm-svn: 275882
diff --git a/clang/lib/Format/UnwrappedLineFormatter.cpp b/clang/lib/Format/UnwrappedLineFormatter.cpp
index 35035ea..07bfe3e 100644
--- a/clang/lib/Format/UnwrappedLineFormatter.cpp
+++ b/clang/lib/Format/UnwrappedLineFormatter.cpp
@@ -10,6 +10,7 @@
 #include "UnwrappedLineFormatter.h"
 #include "WhitespaceManager.h"
 #include "llvm/Support/Debug.h"
+#include <queue>
 
 #define DEBUG_TYPE "format-formatter"