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The Suggested Content toggle has been approved in
https://bugs.chromium.org/p/chromium/issues/detail?id=990279#c148. This
CL enables the feature by default, and updates tests that need to take
this into account.

Bug: 990279
Change-Id: Icc2c8bdf72cff8734aa5941f3fbc2774b38e4c98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462752Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Jia Meng <jiameng@chromium.org>
Commit-Queue: Rachel Wong <wrong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818758}