Revert of Keep track in the browser of which frames have onunload and onbeforeunload handlers.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 40f1d41bf1a00133e5800dffefa5a0f652ebbbec..bcb62a6933e01d4bc174e07f1c9e296f732c8fb4 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1422,9 +1422,7 @@ void WebContentsImpl::WasUnOccluded() {
 bool WebContentsImpl::NeedToFireBeforeUnload() {
   // TODO(creis): Should we fire even for interstitial pages?
   return WillNotifyDisconnection() && !ShowingInterstitialPage() &&
-         !GetRenderViewHost()->SuddenTerminationAllowed() &&
-         (GetMainFrame()->ShouldDispatchBeforeUnload() ||
-          GetMainFrame()->ShouldDispatchUnload());
+         !GetRenderViewHost()->SuddenTerminationAllowed();
 }
 
 void WebContentsImpl::DispatchBeforeUnload() {