Implement learn more bubble on views.

chrome/app/chromium_strings.grd

Index: chrome/app/chromium_strings.grd
diff --git a/chrome/app/chromium_strings.grd b/chrome/app/chromium_strings.grd
index 37a66665201e567329616e44b6d365a5be068752..4662636735d070500907efc855d4b606114f2df3 100644
--- a/chrome/app/chromium_strings.grd
+++ b/chrome/app/chromium_strings.grd
@@ -911,7 +911,7 @@ Signing in anyway will merge Chromium information like bookmarks, history, and o
       <message name="IDS_AUTOFILL_DIALOG_SAVE_LOCALLY_CHECKBOX" desc="Checkbox that controls whether info the user types into the autofill dialog is saved by chrome.">
         Save details in Chromium
       </message>
-      <message name="IDS_AUTOFILL_DIALOG_SAVE_LOCALLY_TOOLTIP" desc="Tooltip which explains function of checkbox that controls whether info the user types into the autofill dialog is saved by chrome.">
+      <message name="IDS_AUTOFILL_DIALOG_SAVE_LOCALLY_LEARN_MORE" desc="Text which explains function of checkbox that controls whether info the user types into the autofill dialog is saved by chrome (shown in an informational bubble).">
         Chromium will securely store your information so you don't need to type it in again, but you will still need to verify your card's security code for future payments.
       </message>
       <message name="IDS_AUTOFILL_NEW_CREDIT_CARD_BUBBLE_TITLE" desc="Title text of the new credit card bubble informing a user their billing information has been saved in chrome.">