Fix early prerender cancellation not working with PlzNavigate.

chrome/browser/prerender/prerender_link_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/prerender/prerender_link_manager.h"
 
 #include <functional>
 #include <limits>
 #include <memory>
 #include <set>
@@ skipping 374 matching lines @@
     std::unique_ptr<PrerenderHandle> handle =
         manager_->AddPrerenderFromLinkRelPrerender(
             (*i)->launcher_child_id, (*i)->render_view_route_id, (*i)->url,
             (*i)->rel_types, (*i)->referrer, (*i)->size);
     if (!handle) {
       // This prerender couldn't be launched, it's gone.
       prerenders_.erase(*i);
       continue;
     }
 
-    // We have successfully started a new prerender.
-    (*i)->handle = handle.release();
-    ++total_started_prerender_count;
-    (*i)->handle->SetObserver(this);
-    if ((*i)->handle->IsPrerendering())
+    if (handle->IsPrerendering()) {
+      // We have successfully started a new prerender.
+      (*i)->handle = handle.release();
+      ++total_started_prerender_count;
+      (*i)->handle->SetObserver(this);
       OnPrerenderStart((*i)->handle);
-    RecordLinkManagerStarting((*i)->rel_types);
-
-    running_launcher_and_render_view_routes.insert(
-        launcher_and_render_view_route);
+      RecordLinkManagerStarting((*i)->rel_types);
+      running_launcher_and_render_view_routes.insert(
+          launcher_and_render_view_route);
+    } else {
+      Send((*i)->launcher_child_id,
+          new PrerenderMsg_OnPrerenderStop((*i)->prerender_id));
+      prerenders_.erase(*i);
+    }
   }
 }
 
 PrerenderLinkManager::LinkPrerender*
 PrerenderLinkManager::FindByLauncherChildIdAndPrerenderId(int launcher_child_id,
                                                           int prerender_id) {
   for (std::list<LinkPrerender>::iterator i = prerenders_.begin();
        i != prerenders_.end(); ++i) {
     if (launcher_child_id == i->launcher_child_id &&
         prerender_id == i->prerender_id) {
@@ skipping 100 matching lines @@
        new PrerenderMsg_OnPrerenderDomContentLoaded(prerender->prerender_id));
 }
 
 void PrerenderLinkManager::OnPrerenderStop(
     PrerenderHandle* prerender_handle) {
   LinkPrerender* prerender = FindByPrerenderHandle(prerender_handle);
   if (!prerender)
     return;
 
   Send(prerender->launcher_child_id,
-       new PrerenderMsg_OnPrerenderStop(prerender->prerender_id));
+      new PrerenderMsg_OnPrerenderStop(prerender->prerender_id));
   RemovePrerender(prerender);
   StartPrerenders();
 }
 
 }  // namespace prerender