Refactor security-icon code to a more general form

chrome/browser/cocoa/autocomplete_text_field.h

Index: chrome/browser/cocoa/autocomplete_text_field.h
===================================================================
--- chrome/browser/cocoa/autocomplete_text_field.h	(revision 29797)
+++ chrome/browser/cocoa/autocomplete_text_field.h	(working copy)
@@ -50,10 +50,6 @@
   // search" into |field_|.
   virtual void OnPasteAndGo() = 0;
 
-  // Called when the user clicks the hint icon (i.e. the security icon) in the
-  // location bar.
-  virtual void OnSecurityIconClicked() = 0;
-
   // Called when the field's frame changes.
   virtual void OnFrameChanged() = 0;
 };