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Currently, we opened suggestions in a background tab when holding the
super (Linux) or command (Mac) keys and pressing enter. The code implies
pressing the window key and pressing enter should behave likewise on
Windows; but this didn't work because key presses aren't propagated when
the window key is held down.

With this CL, holding alt+shift and pressing enter behaves similarly.
This
1) brings feature parity to Windows, and
2) is symmetric to alt+enter which opens the suggestion in a new
foreground tab.

Bug: 898277
Change-Id: Ia6423435e9a3c9de81746ceda266803cad18704c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1937687
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719398}