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LocalFrameView::ScrollContentsSlowPath had an invalidation for
iframes but this invalidation was already handled will full
invalidation. This patch removes this extra invalidation.

This makes the root layer scrolling (RLS) and non-RLS
expectations match because this extra invalidation was not
issued for RLS.

Bug: 781419
Change-Id: I2e6bf51682e24b2e2dfa8b56abffa7665ab2bcf4
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_root_layer_scrolls
Reviewed-on: https://chromium-review.googlesource.com/795183Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520191}