[cleanup] Refactor TestCaseData to use delete

Fixing clang-tidy warning.

Bug: v8:8015
Change-Id: I2ac8b12c040af2ad6122ce14eef8b4f8375e46ac
Reviewed-on: https://chromium-review.googlesource.com/1219708Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55814}

test/cctest/interpreter/test-source-positions.cc

@@ -49,7 +49,7 @@ struct TestCaseData {
   const char* arguments() const { return arguments_; }
 
  private:
-  TestCaseData();
+  TestCaseData() = delete;
 
   const char* const script_;
   const char* const declaration_parameters_;