Remove TODO about removing BLINK_PLATFORM_EXPORT on WebInputEventDeleter

BLINK_PLATFORM_EXPORT can't be safely removed without causing a linker
error on Windows and this fact isn't going away.

Bug: 691714
Change-Id: Ie2399c50877e16fa80f9cb3ebe455c56493e6cce
Reviewed-on: https://chromium-review.googlesource.com/c/1343291
Commit-Queue: Charlie Andrews <charliea@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609857}

third_party/blink/public/platform/web_coalesced_input_event.h

@@ -42,8 +42,6 @@ class BLINK_PLATFORM_EXPORT WebCoalescedInputEvent {
   std::vector<const WebInputEvent*> GetPredictedEventsPointers() const;
 
  private:
-  // TODO(hans): Remove this once clang-cl knows to not inline dtors that
-  // call operator(), https://crbug.com/691714
   struct BLINK_PLATFORM_EXPORT WebInputEventDeleter {
     void operator()(blink::WebInputEvent*) const;
   };