Fix the browser not being notified when a webview embedder handles a navigation.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 5a7b20148ac4011cbe71da2b291f1ec54410e926..b5265b568b18a623dcf83f63ea1c9ea81ece3da7 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -5264,6 +5264,10 @@ WebNavigationPolicy RenderFrameImpl::decidePolicyForNavigation(
           this, is_content_initiated, render_view_was_created_by_renderer,
           frame_, info.urlRequest, info.navigationType, info.defaultPolicy,
           is_redirect)) {
+    if (IsBrowserSideNavigationEnabled()) {
+      // Need to let the browser know so it can notify its observers.
+      Send(new FrameHostMsg_NavigationHandledByEmbedder(routing_id_));
+    }
     return blink::WebNavigationPolicyIgnore;
   }
 #endif