Revert of Remove the is_loading_ field from WebContentsImpl

content/browser/frame_host/navigator_impl.cc

Index: content/browser/frame_host/navigator_impl.cc
diff --git a/content/browser/frame_host/navigator_impl.cc b/content/browser/frame_host/navigator_impl.cc
index 9e67f2dd762e01a36c1b4f27f225a18af7db142b..7457ed9dd47e8308d1c175a5c5cad3e42ca70917 100644
--- a/content/browser/frame_host/navigator_impl.cc
+++ b/content/browser/frame_host/navigator_impl.cc
@@ -338,24 +338,14 @@
   // Double check that here.
   CheckWebUIRendererDoesNotDisplayNormalURL(dest_render_frame_host, dest_url);
 
-  // In the case of a transfer navigation, set the destination RenderFrameHost
-  // as loading.  This ensures that the RenderFrameHost gets in a loading state
-  // without emitting a spurrious DidStartLoading notification at the
-  // FrameTreeNode level (since the FrameTreeNode was already loading). Note
-  // that this works both for a transfer to a different RenderFrameHost and in
-  // the rare case where the navigation is transferred back to the same
-  // RenderFrameHost.
-  bool is_transfer = entry.transferred_global_request_id().child_id != -1;
-  if (is_transfer)
-    dest_render_frame_host->set_is_loading(true);
-
   // Navigate in the desired RenderFrameHost.
   // We can skip this step in the rare case that this is a transfer navigation
   // which began in the chosen RenderFrameHost, since the request has already
   // been issued.  In that case, simply resume the response.
-  bool is_transfer_to_same = is_transfer &&
-                             entry.transferred_global_request_id().child_id ==
-                                 dest_render_frame_host->GetProcess()->GetID();
+  bool is_transfer_to_same =
+      entry.transferred_global_request_id().child_id != -1 &&
+      entry.transferred_global_request_id().child_id ==
+          dest_render_frame_host->GetProcess()->GetID();
   if (!is_transfer_to_same) {
     navigation_data_.reset(new NavigationMetricsData(navigation_start, dest_url,
                                                      entry.restore_type()));
@@ -381,7 +371,6 @@
             controller_->GetEntryCount()));
   } else {
     // No need to navigate again.  Just resume the deferred request.
-    // Also sets the RenderFrameHost back to a loading state again.
     dest_render_frame_host->GetProcess()->ResumeDeferredNavigation(
         entry.transferred_global_request_id());
   }