Remove a useless comment

This patch removes the comment about adding "interpolationType" and
"interpolationSampling" to InterStageVariableInfo as they have already
added before. Sorry that we forgot to remove it in the PR of adding
these two members to InterStageVariableInfo.

BUG=dawn:802

Change-Id: Ib2f3769f2dc1c8152280a28aad77bf90abf76608
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/61384
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
diff --git a/src/dawn_native/ShaderModule.h b/src/dawn_native/ShaderModule.h
index 613033a..c8ad650 100644
--- a/src/dawn_native/ShaderModule.h
+++ b/src/dawn_native/ShaderModule.h
@@ -177,8 +177,6 @@
             fragmentOutputFormatBaseTypes;
         ityp::bitset<ColorAttachmentIndex, kMaxColorAttachments> fragmentOutputsWritten;
 
-        // TODO(dawn:802): store InterpolationType and IntepolationSampling when we add the
-        // validations on them.
         struct InterStageVariableInfo {
             InterStageComponentType baseType;
             uint32_t componentCount;