Fix browser launch on the login screen.

ui/views/controls/webview/web_dialog_view.cc

Index: ui/views/controls/webview/web_dialog_view.cc
diff --git a/ui/views/controls/webview/web_dialog_view.cc b/ui/views/controls/webview/web_dialog_view.cc
index ffb5cbafbde128a55ae95a110b54ea67a4f4ee3d..2ff00cac3e6870287dc6441c0182bcfbad9aaa44 100644
--- a/ui/views/controls/webview/web_dialog_view.cc
+++ b/ui/views/controls/webview/web_dialog_view.cc
@@ -331,6 +331,23 @@ void WebDialogView::BeforeUnloadFired(content::WebContents* tab,
   *proceed_to_fire_unload = proceed;
 }
 
+bool WebDialogView::ShouldCreateWebContents(
+    content::WebContents* web_contents,
+    int route_id,
+    int main_frame_route_id,
+    WindowContainerType window_container_type,
+    const base::string16& frame_name,
+    const GURL& target_url,
+    const std::string& partition_id,
+    content::SessionStorageNamespace* session_storage_namespace) {
+  if (delegate_ && !delegate_->HandleShouldCreateWebContents(
+        web_contents, route_id, main_frame_route_id, window_container_type,
+        frame_name, target_url, partition_id, session_storage_namespace)) {
+    return false;
+  }
+  return true;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // WebDialogView, private: