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

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

 // Copyright 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_BUBBLE_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_AUTOFILL_AUTOFILL_BUBBLE_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
@@ skipping 11 matching lines @@
 // -showWindow: to make the bubble visible. It will autorelease itself when the
 // user dismisses the bubble.
 - (id)initWithParentWindow:(NSWindow*)parentWindow
                    message:(NSString*)message;
 
 // Designated initializer. Creates a bubble with given |message| and insets the
 // text content by |inset|, with the arrow positioned at |arrowLocation|.
 - (id)initWithParentWindow:(NSWindow*)parentWindow
                    message:(NSString*)message
                      inset:(NSSize)inset
+             maxLabelWidth:(CGFloat)maxLabelWidth
              arrowLocation:(info_bubble::BubbleArrowLocation)arrowLocation;
 
-// Maximum width that the bubble will occupy, regardless of message size.
-- (CGFloat)maxWidth;
-
 // Update the current text with |message|.
 - (void)setMessage:(NSString*)message;
 
 @end
 
 
 #endif  // CHROME_BROWSER_UI_COCOA_AUTOFILL_AUTOFILL_BUBBLE_CONTROLLER_H_