Add ContextMenuSourceType to views::ContextMenuController::ShowContextMenuForView.

ui/views/controls/textfield/native_textfield_win.cc

Index: ui/views/controls/textfield/native_textfield_win.cc
diff --git a/ui/views/controls/textfield/native_textfield_win.cc b/ui/views/controls/textfield/native_textfield_win.cc
index 5dae06fc983fcb337ecc40f81760550a9ff0fb1b..8518a6c81e31a53bdf69cf81ee5a744775f8bff6 100644
--- a/ui/views/controls/textfield/native_textfield_win.cc
+++ b/ui/views/controls/textfield/native_textfield_win.cc
@@ -624,7 +624,7 @@ void NativeTextfieldWin::OnContextMenu(HWND window, const POINT& point) {
 
   ignore_result(context_menu_runner_->RunMenuAt(textfield_->GetWidget(), NULL,
       gfx::Rect(gfx::Point(p), gfx::Size()), MenuItemView::TOPLEFT,
-      MenuRunner::HAS_MNEMONICS));
+      ui::MENU_SOURCE_NONE, MenuRunner::HAS_MNEMONICS));
 }
 
 void NativeTextfieldWin::OnCopy() {