Componentize IDS_SYNC_* strings shared with iOS.

In order to share those strings with Chrome on iOS componentize
the IDS_SYNC_* strings currently used on iOS.

BUG=568486
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[email protected]

Review URL: https://codereview.chromium.org/1579563002

Cr-Commit-Position: refs/heads/master@{#368830}
diff --git a/components/components_strings.grd b/components/components_strings.grd
index 67c13574..e48f707 100644
--- a/components/components_strings.grd
+++ b/components/components_strings.grd
@@ -201,6 +201,7 @@
       <part file="policy_strings.grdp" />
       <part file="security_interstitials_strings.grdp" />
       <part file="ssl_errors_strings.grdp" />
+      <part file="sync_ui_strings.grdp" />
       <part file="translate_strings.grdp" />
       <part file="undo_strings.grdp" />
       <part file="version_ui_strings.grdp" />