PlzNavigate: add cancel navigation logic for uncommitted requests

content/browser/frame_host/render_frame_host_manager.cc

 // Copyright 2013 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 "content/browser/frame_host/render_frame_host_manager.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 563 matching lines @@
   navigation_request_.reset(new NavigationRequest(
       info, frame_tree_node_->frame_tree_node_id()));
   navigation_request_->BeginNavigation(params.request_body);
 }
 
 // PlzNavigate
 void RenderFrameHostManager::CommitNavigation(
     const NavigationBeforeCommitInfo& info) {
   CHECK(CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableBrowserSideNavigation));
+  DCHECK(navigation_request_.get());
+  // Ignores navigation commits if the request ID doesn't match the current
+  // active request.
+  if (navigation_request_->navigation_request_id() !=
+          info.navigation_request_id) {
+    return;
+  }
+
   // Pick the right RenderFrameHost to commit the navigation.
   SiteInstance* current_instance = render_frame_host_->GetSiteInstance();
   // TODO(clamy): Replace the default values by the right ones. This may require
   // some storing in RequestNavigation.
   SiteInstance* new_instance = GetSiteInstanceForNavigation(
       info.navigation_url,
       NULL,
       navigation_request_->info().navigation_params.transition_type,
       false,
       false);
@@ skipping 1056 matching lines @@
 void RenderFrameHostManager::DeleteRenderFrameProxyHost(
     SiteInstance* instance) {
   RenderFrameProxyHostMap::iterator iter = proxy_hosts_.find(instance->GetId());
   if (iter != proxy_hosts_.end()) {
     delete iter->second;
     proxy_hosts_.erase(iter);
   }
 }
 
 }  // namespace content