Remove WebWaitableEvent and replace it with WaitableEvent.

third_party/WebKit/public/platform/Platform.h

Index: third_party/WebKit/public/platform/Platform.h
diff --git a/third_party/WebKit/public/platform/Platform.h b/third_party/WebKit/public/platform/Platform.h
index 44d4ec1acee32c906add5f948314222716cbb8f5..e787ce08524755a27fdb2a76b30f9ee5b5358acf 100644
--- a/third_party/WebKit/public/platform/Platform.h
+++ b/third_party/WebKit/public/platform/Platform.h
@@ -53,7 +53,6 @@
 #include "WebString.h"
 #include "WebURLError.h"
 #include "WebVector.h"
-#include "WebWaitableEvent.h"
 
 class GrContext;
 
@@ -348,19 +347,6 @@ public:
     // embedder.
     virtual WebThread* currentThread() { return nullptr; }
 
-    // WaitableEvent -------------------------------------------------------
-
-    // Creates an embedder-defined waitable event object.
-    WebWaitableEvent* createWaitableEvent() { return createWaitableEvent(WebWaitableEvent::ResetPolicy::Auto, WebWaitableEvent::InitialState::NonSignaled); }
-    virtual WebWaitableEvent* createWaitableEvent(WebWaitableEvent::ResetPolicy, WebWaitableEvent::InitialState) { return nullptr; }
-
-    // Waits on multiple events and returns the event object that has been
-    // signaled. This may return nullptr if it fails to wait events.
-    // Any event objects given to this method must not deleted while this
-    // wait is happening.
-    virtual WebWaitableEvent* waitMultipleEvents(const WebVector<WebWaitableEvent*>& events) { return nullptr; }
-
-
     // Resources -----------------------------------------------------------
 
     // Returns a blob of data corresponding to the named resource.