Adds "Certificate Information" label for page_info_model.

chrome/browser/page_info_model.h

Index: chrome/browser/page_info_model.h
diff --git a/chrome/browser/page_info_model.h b/chrome/browser/page_info_model.h
index 9ddaa1435192e0c4c7111e7b87f754f6fc2eb5fc..7427e67f5b3d67ed13b1241ee31650df2ca9dc85 100644
--- a/chrome/browser/page_info_model.h
+++ b/chrome/browser/page_info_model.h
@@ -95,6 +95,9 @@ class PageInfoModel {
                              int count,
                              base::Time first_visit);
 
+  // Returns the label for the "Certificate Information", if needed.
+  string16 GetCertificateLabel() const;
+
  protected:
   // Testing constructor. DO NOT USE.
   PageInfoModel();
@@ -112,6 +115,9 @@ class PageInfoModel {
   // Used to request number of visits.
   CancelableRequestConsumer request_consumer_;
 
+  // Label for "Certificate Information", if needed.
+  string16 certificate_label_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(PageInfoModel);
 };