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This CL replaces all occurrences of "about:sync" with
"chrome://sync-internals", so the URL is the same everywhere.

Bug: 1137739
Change-Id: I461582da8aa9d809ffe72715d09456fc7818652c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2470077Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Paula Vidas <paulavidas@google.com>
Cr-Commit-Position: refs/heads/master@{#817002}