[CodeCompletion] Remove invalid using namespace in PossibleParamInfo.h

Author: ahoppen

include/swift/IDE/PossibleParamInfo.h

@@ -15,7 +15,8 @@
 
 #include "swift/AST/Types.h"
 
-using namespace swift;
+namespace swift {
+namespace ide {
 
 struct PossibleParamInfo {
   /// Expected parameter.
@@ -34,4 +35,7 @@ struct PossibleParamInfo {
   };
 };
 
+} // end namespace ide
+} // end namespace swift
+
 #endif // SWIFT_IDE_POSSIBLEPARAMINFO_H