Remove the is_loading_ field from WebContentsImpl

content/renderer/render_frame_impl.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/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 4672 matching lines @@
   // provide it with the response to the request.
   scoped_ptr<StreamOverrideParameters> stream_override(
       new StreamOverrideParameters());
   stream_override->stream_url = stream_url;
   stream_override->response = response;
 
   NavigateInternal(common_params, StartNavigationParams(), request_params,
                    std::move(stream_override));
 }
 
+// PlzNavigate
 void RenderFrameImpl::OnFailedNavigation(
     const CommonNavigationParams& common_params,
     const RequestNavigationParams& request_params,
     bool has_stale_copy_in_cache,
     int error_code) {
+  DCHECK(IsBrowserSideNavigationEnabled());
   bool is_reload = IsReload(common_params.navigation_type);
   bool is_history_navigation = request_params.page_state.IsValid();
   WebURLRequest::CachePolicy cache_policy =
       WebURLRequest::UseProtocolCachePolicy;
   RenderFrameImpl::PrepareRenderViewForNavigation(
       common_params.url, request_params, &is_reload, &cache_policy);
 
   GetContentClient()->SetActiveURL(common_params.url);
 
   pending_navigation_params_.reset(new NavigationParams(
       common_params, StartNavigationParams(), request_params));
 
   // Inform the browser of the start of the provisional load. This is needed so
   // that the load is properly tracked by the WebNavigation API.
   Send(new FrameHostMsg_DidStartProvisionalLoad(
       routing_id_, common_params.url, common_params.navigation_start));
 
   // Send the provisional load failure.
   blink::WebURLError error =
       CreateWebURLError(common_params.url, has_stale_copy_in_cache, error_code);
   WebURLRequest failed_request = CreateURLRequestForNavigation(
       common_params, scoped_ptr<StreamOverrideParameters>(),
       frame_->isViewSourceModeEnabled());
   SendFailedProvisionalLoad(failed_request, error, frame_);
 
+  // This check should have been done on the browser side already.
   if (!ShouldDisplayErrorPageForFailedLoad(error_code, common_params.url)) {
-    // TODO(avi): Remove this; we shouldn't ever be dropping navigations.
-    // http://crbug.com/501960
-    Send(new FrameHostMsg_DidDropNavigation(routing_id_));
+    NOTREACHED();
     return;
   }
 
   // Make sure errors are not shown in view source mode.
   frame_->enableViewSourceMode(false);
 
   // Replace the current history entry in reloads, history navigations and loads
   // of the same url. This corresponds to Blink's notion of a standard
   // commit.
   // TODO(clamy): see if initial commits in subframes should be handled
@@ skipping 757 matching lines @@
       bool is_client_redirect = browser_side_navigation
                                     ? !!(common_params.transition &
                                          ui::PAGE_TRANSITION_CLIENT_REDIRECT)
                                     : false;
 
       // Load the request.
       frame_->toWebLocalFrame()->load(request, load_type,
                                       item_for_history_navigation,
                                       history_load_type, is_client_redirect);
     }
+  } else {
+    // The browser expects the frame to be loading this navigation. Inform it
+    // that the load stopped if needed.
+    if (!frame_->isLoading())
+      Send(new FrameHostMsg_DidStopLoading(routing_id_));
   }
 
   // In case LoadRequest failed before didCreateDataSource was called.
   pending_navigation_params_.reset();
 }
 
 void RenderFrameImpl::UpdateEncoding(WebFrame* frame,
                                      const std::string& encoding_name) {
   // Only update main frame's encoding_name.
   if (!frame->parent())
@@ skipping 594 matching lines @@
                                     int match_count,
                                     int ordinal,
                                     const WebRect& selection_rect,
                                     bool final_status_update) {
   Send(new FrameHostMsg_Find_Reply(routing_id_, request_id, match_count,
                                    selection_rect, ordinal,
                                    final_status_update));
 }
 
 }  // namespace content