Clang: Remove pointless call in tests

It was added only for debugging.

Change-Id: I7ea80d8d472f319cdcac548d3abf602e0f304fc9
Reviewed-by: David Schulz <david.schulz@qt.io>

tests/unit/unittest/highlightingmarks-test.cpp

@@ -1131,7 +1131,6 @@ TEST_F(HighlightingMarks, PreprocessorIfDirective)
 TEST_F(HighlightingMarks, PreprocessorInclusionDirectiveWithKeyword)
 {
     const auto infos = translationUnit.highlightingMarksInRange(sourceRange(561, 15));
-    infos.toHighlightingMarksContainers();
 
     ASSERT_THAT(infos[3], HasOnlyType(HighlightingType::StringLiteral));
 }