cc: Clean up LayerTreeTest and TestHooks.

cc/cc_tests.gyp

Index: cc/cc_tests.gyp
diff --git a/cc/cc_tests.gyp b/cc/cc_tests.gyp
index b8e59a68fd40cb516f27703a05ccf253770550d2..14ead61149659646c94ff4dd10c8811128fc850e 100644
--- a/cc/cc_tests.gyp
+++ b/cc/cc_tests.gyp
@@ -153,9 +153,6 @@
       'trees/occlusion_unittest.cc',
       'trees/property_tree_unittest.cc',
       'trees/proxy_common_unittest.cc',
-      'trees/proxy_impl_unittest.cc',
-      'trees/remote_channel_unittest.cc',
-      'trees/threaded_channel_unittest.cc',
       'trees/tree_synchronizer_unittest.cc',
     ],
     'cc_surfaces_unit_tests_source_files': [
@@ -279,12 +276,6 @@
       'test/pixel_test_software_output_device.h',
       'test/pixel_test_utils.cc',
       'test/pixel_test_utils.h',
-      'test/proxy_impl_for_test.cc',
-      'test/proxy_impl_for_test.h',
-      'test/proxy_main_for_test.cc',
-      'test/proxy_main_for_test.h',
-      'test/remote_channel_impl_for_test.cc',
-      'test/remote_channel_impl_for_test.h',
       'test/remote_proto_channel_bridge.cc',
       'test/remote_proto_channel_bridge.h',
       'test/render_pass_test_utils.cc',
@@ -332,8 +323,6 @@
       'test/test_tile_task_runner.h',
       'test/test_web_graphics_context_3d.cc',
       'test/test_web_graphics_context_3d.h',
-      'test/threaded_channel_for_test.cc',
-      'test/threaded_channel_for_test.h',
     ],
   },
   'targets': [