Remove PrerenderManager::OnCloseWebContentsDeleter::SwappedOut

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index 3bc6d9cede0a50e42322ca4d469d7d37971711cc..17bb6d9118d221f758ff49859f2177030127e4ea 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -144,11 +144,6 @@ class PrerenderManager::OnCloseWebContentsDeleter
     ScheduleWebContentsForDeletion(false);
   }
 
-  void SwappedOut(WebContents* source) override {
-    DCHECK_EQ(tab_.get(), source);
-    ScheduleWebContentsForDeletion(false);
-  }
-
   bool ShouldSuppressDialogs(WebContents* source) override {
     // Use this as a proxy for getting statistics on how often we fail to honor
     // the beforeunload event.