Remove unactionable TODO

There are no immediate plans to tamper with this aspect of Priority
Hints. If there is in future experimentation, we will make the necessary
changes, but for now, this TODO is not actionable.

R=yhirano@chromium.org

Bug: 821464
Change-Id: I787e7db3967f618000d391b87576f1312879fe94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1945939
Auto-Submit: Dominic Farolino <dom@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720405}

third_party/blink/renderer/platform/loader/fetch/resource_fetcher.cc

@@ -235,8 +235,7 @@ ResourceLoadPriority AdjustPriorityWithPriorityHint(
       //     out-of-viewport images already have priority set to kLow
       // - Link preloads
       //     For this initial implementation we do a blanket demotion regardless
-      //     of `as` value/type. TODO(domfarolino): maybe discuss a more
-      //     granular approach with loading team
+      //     of `as` value/type.
       if (type == ResourceType::kImage ||
           resource_request.GetRequestContext() ==
               mojom::RequestContextType::FETCH ||