Add WebContentObserver::OnWebContentsLostFocus()

content/browser/web_contents/web_contents_view_aura.cc

Index: content/browser/web_contents/web_contents_view_aura.cc
diff --git a/content/browser/web_contents/web_contents_view_aura.cc b/content/browser/web_contents/web_contents_view_aura.cc
index a12d017e47a36e800b83d82c28bdf4f014490213..a28f4fb006c0dcfc1fac325576f03ffbcaa095e9 100644
--- a/content/browser/web_contents/web_contents_view_aura.cc
+++ b/content/browser/web_contents/web_contents_view_aura.cc
@@ -1016,6 +1016,10 @@ void WebContentsViewAura::GotFocus() {
   web_contents_->NotifyWebContentsFocused();
 }
 
+void WebContentsViewAura::LostFocus() {
+  web_contents_->NotifyWebContentsLostFocus();
+}
+
 void WebContentsViewAura::TakeFocus(bool reverse) {
   if (web_contents_->GetDelegate() &&
       !web_contents_->GetDelegate()->TakeFocus(web_contents_, reverse) &&