Correct the language to use in PIB for the billing interstitial

Bug: 882979
Change-Id: I7c4b717a39da3ee11d62a9bd5d91e7a5b42d6b2e
Reviewed-on: https://chromium-review.googlesource.com/1220469Reviewed-by: Adrienne Porter Felt <felt@chromium.org>
Commit-Queue: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590487}

components/page_info_strings.grdp

@@ -428,7 +428,7 @@
 
      <!-- Billing -->
     <message name="IDS_PAGE_INFO_BILLING_SUMMARY" desc="A one-line summary at the top of the Page Info bubble (which shows when you click the security indicator) if the website has been flagged for a billing interstitial">
-      The page ahead may try to charge you money
+      This page may try to charge you money
     </message>
     <message name="IDS_PAGE_INFO_BILLING_DETAILS" desc="A one-line summary at the top of the Page Info bubble (which shows when you click the security indicator) if the website has been flagged for a billing interstitial.">
       These charges could be one-time or recurring and may not be obvious.