[clear-browsing-data] Change history string for 'sync is paused' state

When sync is paused, the string for the history checkbox is changed from
"Clears history and autocompletions in the address bar. Your account may
have other forms of browsing history at myactivity.google.com."
to "Clears history and autocompletions in the address bar."

Bug: 893696
Change-Id: I1aba27b8902b39bc2e28e8e66e564a58327fcc33
Reviewed-on: https://chromium-review.googlesource.com/c/1280672
Reviewed-by: Scott Chen <[email protected]>
Commit-Queue: Thomas Tangl <[email protected]>
Cr-Original-Commit-Position: refs/heads/master@{#599712}(cherry picked from commit 6861eea)
Reviewed-on: https://chromium-review.googlesource.com/c/1284369
Reviewed-by: Thomas Tangl <[email protected]>
Cr-Commit-Position: refs/branch-heads/3578@{#59}
Cr-Branched-From: 4226ddf-refs/heads/master@{#599034}

chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.js

@@ -258,7 +258,7 @@ Polymer({
       historySummarySignedIn, historySummarySynced) {
     if (isSyncingHistory && !hasSyncError) {
       return historySummarySynced;
-    } else if (isSignedIn) {
+    } else if (isSignedIn && !this.isSyncPaused_) {
       return historySummarySignedIn;
     }
     return historySummary;