https://codereview.chromium.org/2960613002 added two i18n message strings

1) ./chrome/app/chromium_strings.grd
  string IDS_LOGIN_POD_USER_REMOVE_WARNING_SYNC
    This person's browsing data will be deleted from this device. To recover the data, sign in to Chromium as $2.

2) ./chrome/app/google_chrome_strings.grd
  string IDS_LOGIN_POD_USER_REMOVE_WARNING_SYNC
    This person's browsing data will be deleted from this device. To recover the data, sign in to Chrome as $2.

Placeholder elements like $1 $2, should be wrapped in <ph> elements according to the docs [1] [2]

[1] https://sites.google.com/a/chromium.org/dev/developers/design-documents/ui-localization#TOC-How-to-add-a-string
[2] https://sites.google.com/a/chromium.org/dev/developers/tools-we-use-in-chromium/grit/grit-users-guide#Adding_Resources

along with and <ex> element giving an example.

  <ph name="USER_EMAIL">$2<ex>foo@example.com</ex></ph>

When this is not done, applications can fail to work when reading the i18n translated strings, sadly.

There are 2 error cases, can we please fix?