Remove //cc/ipc:struct_traits

cc/ipc/BUILD.gn

Index: cc/ipc/BUILD.gn
diff --git a/cc/ipc/BUILD.gn b/cc/ipc/BUILD.gn
index 42eaf444d11a0eabe11071c3d90a3a392fcb9c62..15772b600064c8f19b13790334fd3fad9cb15073 100644
--- a/cc/ipc/BUILD.gn
+++ b/cc/ipc/BUILD.gn
@@ -96,51 +96,3 @@ mojom("test_interfaces") {
     ":interfaces",
   ]
 }
-
-cc_source_set("struct_traits") {
-  sources = [
-    "begin_frame_args_struct_traits.h",
-    "compositor_frame_metadata_struct_traits.cc",
-    "compositor_frame_metadata_struct_traits.h",
-    "compositor_frame_struct_traits.cc",
-    "compositor_frame_struct_traits.h",
-    "copy_output_request_struct_traits.cc",
-    "copy_output_request_struct_traits.h",
-    "copy_output_result_struct_traits.cc",
-    "copy_output_result_struct_traits.h",
-    "filter_operation_struct_traits.h",
-    "filter_operations_struct_traits.h",
-    "frame_sink_id_struct_traits.h",
-    "local_surface_id_struct_traits.h",
-    "quads_struct_traits.cc",
-    "quads_struct_traits.h",
-    "render_pass_struct_traits.cc",
-    "render_pass_struct_traits.h",
-    "selection_struct_traits.h",
-    "shared_quad_state_struct_traits.h",
-    "surface_id_struct_traits.h",
-    "surface_info_struct_traits.h",
-    "surface_reference_struct_traits.h",
-    "surface_sequence_struct_traits.h",
-    "texture_mailbox_struct_traits.h",
-    "transferable_resource_struct_traits.cc",
-    "transferable_resource_struct_traits.h",
-  ]
-  public_deps = [
-    ":interfaces_shared_cpp_sources",
-    "//base",
-    "//cc",
-    "//cc/surfaces:surface_id",
-    "//gpu/ipc/common:struct_traits",
-    "//mojo/common:struct_traits",
-    "//skia/public/interfaces",
-    "//skia/public/interfaces:struct_traits",
-    "//ui/events:events_base",
-    "//ui/events/mojo:struct_traits",
-    "//ui/gfx",
-    "//ui/gfx:selection_bound",
-    "//ui/gfx/geometry/mojo:struct_traits",
-    "//ui/gfx/mojo:mojo",
-    "//ui/gfx/mojo:struct_traits",
-  ]
-}