WebWaitableEvent: deprecate old API implementation

content/child/blink_platform_impl.cc

Index: content/child/blink_platform_impl.cc
diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index a5db5a489fc273a4a82c505556d3abe012ace282..1fbb0a5439a65e14c143a9b8a700405994d01417 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -544,13 +544,6 @@ void BlinkPlatformImpl::yieldCurrentThread() {
   base::PlatformThread::YieldCurrentThread();
 }
 
-// TODO(toyoshim): Remove no arguments version after the transition.
-blink::WebWaitableEvent* BlinkPlatformImpl::createWaitableEvent() {
-  return new WebWaitableEventImpl(
-    blink::WebWaitableEvent::ResetPolicy::Auto,
-    blink::WebWaitableEvent::InitialState::NonSignaled);
-}
-
 blink::WebWaitableEvent* BlinkPlatformImpl::createWaitableEvent(
     blink::WebWaitableEvent::ResetPolicy policy,
     blink::WebWaitableEvent::InitialState state) {