Fix browser launch on the login screen.

chrome/browser/chromeos/login/ui/login_web_dialog.cc

Index: chrome/browser/chromeos/login/ui/login_web_dialog.cc
diff --git a/chrome/browser/chromeos/login/ui/login_web_dialog.cc b/chrome/browser/chromeos/login/ui/login_web_dialog.cc
index 4aac5afc723c38098500f5d955bc740a6499becc..698e0c5f1122b63f5ee28b405a4d6a2388fbc01e 100644
--- a/chrome/browser/chromeos/login/ui/login_web_dialog.cc
+++ b/chrome/browser/chromeos/login/ui/login_web_dialog.cc
@@ -10,6 +10,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/login/helper.h"
 #include "chrome/browser/ui/browser_dialogs.h"
+#include "chrome/browser/ui/browser_finder.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
@@ -157,6 +158,25 @@ bool LoginWebDialog::HandleContextMenu(
   return true;
 }
 
+bool LoginWebDialog::HandleOpenURLFromTab(
+    content::WebContents* source,
+    const content::OpenURLParams& params,
+    content::WebContents** out_new_contents) {
+  return (source && !chrome::FindBrowserWithWebContents(source));
+}
+
+bool LoginWebDialog::HandleShouldCreateWebContents(
+    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) {
+  return false;
+}
+
 void LoginWebDialog::Observe(int type,
                              const content::NotificationSource& source,
                              const content::NotificationDetails& details) {