[Visual Viewport] Fix a new null dereference.
Fixes a null-dereference regression from a recent CL that added support for scrolling to a position:fixed element when there a scrollable visual viewport. Also implements GetSmoothScrollSequencer by getting it from the main frame if possible. BUG=992683 Change-Id: I75cbb7e25e1a8289e1405f01d2d9ddfafb785361 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1749549 Commit-Queue: David Bokan <bokan@chromium.org> Reviewed-by:David Bokan <bokan@chromium.org> Auto-Submit: Donn Denman <donnd@chromium.org> Cr-Commit-Position: refs/heads/master@{#686414}
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