Mojo remove extraneous todo

Remove a TODO asking to support more kinds as this todo is no longer
actual. All types are supported except two deprecated ones (covered by
another comment) and typemapped types which should be supported in
|base/trace_event/trace_conversion_helper.h|.

Bug: 1103623
Change-Id: I5c2e44cc46e6b4b83be8c175b07a2f785dc805d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2385278
Commit-Queue: Karel Král <karelkral@google.com>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803415}

mojo/public/tools/bindings/generators/cpp_tracing_support.py

@@ -265,7 +265,6 @@ def _WriteInputParamForTracingImpl(generator, kind, cpp_parameter_name,
       for line in inner_lines(cpp_parameter_name):
         yield line
 
-  # TODO(crbug.com/1103623): Support more involved types.
   if mojom.IsEnumKind(kind):
     if generator._IsTypemappedKind(kind) or IsNativeOnlyKind(kind):
       yield output_context.AddSingleValue(