Add an iOS-specific version of the card unmask storage tooltip.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 503773828872952770128f742c18c9bbe6a2ba1f..8c9daba9615471eefb9e6334bbdcbaf56347dfcc 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -11324,6 +11324,9 @@ I don't think this site should be blocked!
       <message name="IDS_AUTOFILL_CARD_UNMASK_PROMPT_STORAGE_TOOLTIP" desc="Text that provides further explanation for checkbox in card unmasking dialog that allows user to store a Wallet card on their local device." formatter_data="android_java">
         If checked, Chrome will store a copy of your card on this device for faster form filling.
       </message>
+      <message name="IDS_AUTOFILL_CARD_UNMASK_PROMPT_STORAGE_TOOLTIP_IOS" desc="Text that provides further explanation on iOS for the option in the card unmasking dialog that allows user to store a Wallet card on their local device." formatter_data="android_java">
+        If enabled, Chrome will store a copy of your card on this device for faster form filling.
+      </message>
       <message name="IDS_AUTOFILL_CARD_UNMASK_CONFIRM_BUTTON" desc="Text for button that confirms the credit card CVC entry dialog." formatter_data="android_java">
         Verify
       </message>