GitLab

This CL does some refactoring work:
1. Save existing MV tiles info instead of only SiteSuggestion data.
2. Remove MV tiles favicons saving codes - the cached favicons are not
   always consistent with post-native ones so we show the default grey
   background icon instead.
3. Since favicons are no longer cached, we don't need to keep
   |mUrlToIdMap| and |mUrlsToUpdateFavicon|.
4. SiteSuggestion#faviconId is no longer needed.

Bug: 1067386
Change-Id: I2f05ea32a04c30ef8ed21504a78a77771edb4043
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611670Reviewed-by: Cathy Li <chili@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Commit-Queue: Hao Dong <spdonghao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845955}