[lldb][NFC] Remove unused ConstString includes in Utility (#145983)

Author: bulbazord

lldb/include/lldb/Utility/Broadcaster.h

@@ -9,11 +9,11 @@
 #ifndef LLDB_UTILITY_BROADCASTER_H
 #define LLDB_UTILITY_BROADCASTER_H
 
-#include "lldb/Utility/ConstString.h"
 #include "lldb/lldb-defines.h"
 #include "lldb/lldb-forward.h"
 
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
 
 #include <cstdint>
 #include <map>

lldb/include/lldb/Utility/Event.h

@@ -10,7 +10,6 @@
 #define LLDB_UTILITY_EVENT_H
 
 #include "lldb/Utility/Broadcaster.h"
-#include "lldb/Utility/ConstString.h"
 #include "lldb/Utility/Predicate.h"
 #include "lldb/Utility/StructuredData.h"
 #include "lldb/lldb-defines.h"