cc: Move list_container_unittest.cc to cc/base/.

This CL takes care of moving unittest file to cc/base. The
ListContainer class now gets tested using dummy classes of following
types -

1. DerivedElement - This has classes derived from it. This tests
classes created using ListContainer(size_t max_size_for_derived_class)
constructor.

2. NonDerivedElement - This does not have any classes derived from it.
This tests classes created using ListContainer() constructor.

BUG=492952
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1165653002

Cr-Commit-Position: refs/heads/master@{#333095}

cc/BUILD.gn

@@ -772,6 +772,7 @@ test("cc_unittests") {
     "animation/transform_operations_unittest.cc",
     "base/float_quad_unittest.cc",
     "base/histograms_unittest.cc",
+    "base/list_container_unittest.cc",
     "base/math_util_unittest.cc",
     "base/region_unittest.cc",
     "base/rolling_time_delta_history_unittest.cc",
@@ -837,7 +838,6 @@ test("cc_unittests") {
     "playback/pixel_ref_map_unittest.cc",
     "playback/recording_source_unittest.cc",
     "quads/draw_quad_unittest.cc",
-    "quads/list_container_unittest.cc",
     "quads/render_pass_unittest.cc",
     "raster/scoped_gpu_raster_unittest.cc",
     "raster/task_graph_runner_unittest.cc",

cc/cc_tests.gyp

@@ -16,6 +16,7 @@
       'base/delayed_unique_notifier_unittest.cc',
       'base/float_quad_unittest.cc',
       'base/histograms_unittest.cc',
+      'base/list_container_unittest.cc',
       'base/math_util_unittest.cc',
       'base/region_unittest.cc',
       'base/rolling_time_delta_history_unittest.cc',
@@ -85,7 +86,6 @@
       'playback/recording_source_unittest.cc',
       'quads/draw_polygon_unittest.cc',
       'quads/draw_quad_unittest.cc',
-      'quads/list_container_unittest.cc',
       'quads/render_pass_unittest.cc',
       'raster/scoped_gpu_raster_unittest.cc',
       'raster/task_graph_runner_unittest.cc',