Remove unused variables, cc/ edition.

cc/cc_tests.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
     'cc_unit_tests_source_files': [
       'animation/animation_host_unittest.cc',
       'animation/animation_player_unittest.cc',
@@ skipping 392 matching lines @@
         'quads/draw_quad_perftest.cc',
         'raster/raster_buffer_provider_perftest.cc',
         'raster/task_graph_runner_perftest.cc',
         'raster/texture_compressor_perftest.cc',
         'surfaces/surface_aggregator_perftest.cc',
         'test/cc_test_suite.cc',
         'test/run_all_perftests.cc',
         'tiles/tile_manager_perftest.cc',
         'trees/layer_tree_host_common_perftest.cc',
         'trees/layer_tree_host_perftest.cc',
-        'trees/occlusion_tracker_perftest.cc',
       ],
       'conditions': [
         ['OS == "android"',
           {
             'dependencies': [
               '../testing/android/native_test.gyp:native_test_native_code',
             ],
           }
         ],
       ],
@@ skipping 100 matching lines @@
                   '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }],
   ],
 }