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Instead of overriding GetWindow{Title,Icon}, use the explicit
setters for these values, and don't store the title/icon locally.

Bug: 1075649
Change-Id: Ic69156fa8c5265bb2b421e9a56470ad5812c84be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412987Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807613}