[WebLayer] Whitelist non-overridable SSL error strings

This CL whitelists the strings needed to show SSL error interstitials
for non-overridable SSL errors (i.e., errors where the user is not
allowed to proceed).

To test: Visit badssl.com in weblayer_shell on Android, tap on
"mitm-software", and test that an SSL error interstitial shows wherein
the buttons are "Reload" and "Advanced", and clicking on "Advanced"
does not present an option to proceed. In particular, the app should
not crash :).

Change-Id: I4cb8b4aa2289bc0830eaa7e035779e64e3498fb8
Binary-Size: Increase is due to translations and so cannot be avoided.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899608
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Pavel Shmakov <pshmakov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712604}

weblayer/grit_strings_whitelist.txt

 IDS_SSL_OPEN_DETAILS_BUTTON
 IDS_SSL_CLOSE_DETAILS_BUTTON
+IDS_SSL_NONOVERRIDABLE_HSTS
+IDS_SSL_NONOVERRIDABLE_INVALID
+IDS_SSL_NONOVERRIDABLE_MORE
+IDS_SSL_NONOVERRIDABLE_PINNED
+IDS_SSL_NONOVERRIDABLE_REVOKED
 IDS_SSL_OVERRIDABLE_SAFETY_BUTTON
 IDS_SSL_OVERRIDABLE_PROCEED_PARAGRAPH
+IDS_SSL_RELOAD
 IDS_SSL_V2_TITLE
 IDS_SSL_V2_HEADING
 IDS_SSL_V2_PRIMARY_PARAGRAPH