Add page_info_strings.grdp to the page_info watchlist.

BUG=661799

Review-Url: https://codereview.chromium.org/2800563002
Cr-Commit-Position: refs/heads/master@{#462967}

WATCHLISTS

@@ -836,8 +836,9 @@
       'filepath': 'chrome/browser/ui/page_info/'\
                   '|chrome/browser/ui/.*/page_info/'\
                   '|chrome/android/java/src/org/chromium/chrome/browser/page_info/'\
+                  '|components/page_info_strings.grdp'\
                   '|ios/chrome/browser/ui/omnibox/page_info_'
-  },
+    },
     'page_load_metrics' : {
       'filepath': 'chrome/browser/page_load_metrics/'\
                   '|chrome/common/page_load_metrics/'\