Remove unused import.

[marysiuniq]

I removed unused import following the suggestion.

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.24%. Comparing base (8129686) to head (a7bf0a7).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5113   +/-   ##
=========================================
  Coverage     37.24%   37.24%           
  Complexity     2343     2343           
=========================================
  Files           517      517           
  Lines         15630    15630           
  Branches       2975     2975           
=========================================
  Hits           5822     5822           
  Misses         9521     9521           
  Partials        287      287           

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[vil02]

Thanks! This is valuable from the point of view of #5110.