Remove make-css-file-arrays.pl.

Source/build/scripts/scripts.gypi

 # The GN build definitions for these variables are in scripts.gni.
 {
     'variables': {
         'scripts_for_in_files': [
             # jinja2/__init__.py contains version string, so sufficient as
             # dependency for whole jinja2 package
             '<(DEPTH)/third_party/jinja2/__init__.py',
             '<(DEPTH)/third_party/markupsafe/__init__.py',  # jinja2 dep
             'hasher.py',
             'in_file.py',
@@ skipping 29 matching lines @@
             'templates/ElementWrapperFactory.cpp.tmpl',
             'templates/ElementWrapperFactory.h.tmpl',
         ],
         'make_element_type_helpers_files': [
             '<@(make_qualified_names_files)',
             'make_element_type_helpers.py',
             'templates/ElementTypeHelpers.h.tmpl',
         ],
         'conditions': [
             ['OS=="win"', {
-                # Using native perl rather than cygwin perl cuts execution time
-                # of idl preprocessing rules by a bit more than 50%.
-                'perl_exe': '<(DEPTH)/third_party/perl/perl/bin/perl.exe',
                 'gperf_exe': '<(DEPTH)/third_party/gperf/bin/gperf.exe',
                 'bison_exe': '<(DEPTH)/third_party/bison/bin/bison.exe',
               },{
-                'perl_exe': 'perl',
                 'gperf_exe': 'gperf',
                 'bison_exe': 'bison',
               }],
          ],
     },
 }