Add a serial number column to the certificate selector dialog and fix its size.

chrome/browser/ui/views/certificate_selector.h

Index: chrome/browser/ui/views/certificate_selector.h
diff --git a/chrome/browser/ui/views/certificate_selector.h b/chrome/browser/ui/views/certificate_selector.h
index 1c01233828a02be285e8fe9cfb5d4e0c80d93889..5eb701a2287e5370db51f3151a33619944f490f3 100644
--- a/chrome/browser/ui/views/certificate_selector.h
+++ b/chrome/browser/ui/views/certificate_selector.h
@@ -24,6 +24,10 @@ class TableView;
 class View;
 }
 
+namespace ui {
+class TableModel;
+}
+
 namespace chrome {
 
 // A base class for dialogs that show a given list of certificates to the user.
@@ -79,6 +83,8 @@ class CertificateSelector : public views::DialogDelegateView,
   // certificate selection is.
   void InitWithText(std::unique_ptr<views::View> text_label);
 
+  ui::TableModel* table_model_for_testing() const;
+
  private:
   class CertificateTableModel;