Use (i) icon and the same tooltip for the credit cards dialog and account chooser on Mac.

chrome/browser/ui/cocoa/autofill/autofill_dialog_constants.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_COCOA_AUTOFILL_AUTOFILL_DIALOG_CONSTANTS_H_
 #define CHROME_BROWSER_UI_COCOA_AUTOFILL_AUTOFILL_DIALOG_CONSTANTS_H_
 
 // Constants governing layout of autofill dialog.
 namespace autofill {
 
@@ skipping 13 matching lines @@
 // Padding between top bar and details section, as well as between the bottom of
 // the details section and the button strip.
 const int kDetailVerticalPadding = 10;
 
 // Fixed width for a single input field.
 const CGFloat kFieldWidth = 104;
 
 // Horizontal padding between fields
 const CGFloat kHorizontalFieldPadding = 8;
 
+// Size of the information icon in the footer.
+const CGFloat kInfoIconSize = 16;
+
 }  // autofill
 
 #endif  // CHROME_BROWSER_UI_COCOA_AUTOFILL_AUTOFILL_DIALOG_CONSTANTS_H_