Change infobar creation to use a public static Create() method on the infobar delegate classes.

chrome/browser/infobars/insecure_content_infobar_delegate.h

Index: chrome/browser/infobars/insecure_content_infobar_delegate.h
===================================================================
--- chrome/browser/infobars/insecure_content_infobar_delegate.h	(revision 175396)
+++ chrome/browser/infobars/insecure_content_infobar_delegate.h	(working copy)
@@ -16,12 +16,12 @@
     RUN,      // Shown when "active" content (e.g. script) has been blocked.
   };
 
-  InsecureContentInfoBarDelegate(InfoBarService* infobar_service,
-                                 InfoBarType type);
-  virtual ~InsecureContentInfoBarDelegate();
+  // Depending on the |type| requested and whether an insecure content infobar
+  // is already present in |infobar_service|, may do nothing; otherwise, creates
+  // an insecure content delegate and either adds it to |infobar_service| or
+  // replaces the existing infobar delegate.
+  static void Create(InfoBarService* infobar_service, InfoBarType type);
 
-  InfoBarType type() const { return type_; }
-
  private:
   enum HistogramEvents {
     DISPLAY_INFOBAR_SHOWN = 0,  // Infobar was displayed.
@@ -35,6 +35,10 @@
     NUM_EVENTS
   };
 
+  InsecureContentInfoBarDelegate(InfoBarService* infobar_service,
+                                 InfoBarType type);
+  virtual ~InsecureContentInfoBarDelegate();
+
   // ConfirmInfoBarDelegate:
   virtual void InfoBarDismissed() OVERRIDE;
   virtual InsecureContentInfoBarDelegate*