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

chrome/browser/ui/cocoa/passwords/credential_item_button.h

 // Copyright 2016 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_PASSWORDS_CREDENTIAL_ITEM_BUTTON_H_
 #define CHROME_BROWSER_UI_COCOA_PASSWORDS_CREDENTIAL_ITEM_BUTTON_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "components/password_manager/core/common/credential_manager_types.h"
 #import "ui/base/cocoa/hover_button.h"
 
 namespace autofill {
 struct PasswordForm;
 }  // namespace autofill
 
 // A custom button that allows for setting a background color when hovered over.
 @interface CredentialItemButton : HoverButton
 @property(nonatomic) autofill::PasswordForm* passwordForm;
 @property(nonatomic) password_manager::CredentialType credentialType;
 
 - (id)initWithFrame:(NSRect)frameRect
     backgroundColor:(NSColor*)backgroundColor
          hoverColor:(NSColor*)hoverColor;
+
+// Adds (i) icon with a tooltip to the view.
+- (NSView*)addInfoIcon:(NSString*)tooltip;
+
+// Returns an image to be used as a default avatar.
 + (NSImage*)defaultAvatar;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_PASSWORDS_CREDENTIAL_ITEM_BUTTON_H_