GitLab

Rename SelectedLayoutObjects variable name.

Rename from |invalidation_set| to |selected_objects| to
correspond the type name.
Plus, they are not always invalidated.

This patch is a preparation for minimizing LayoutObject invalidation:
http://crrev.com/c/720817

Bug: 739062
Change-Id: I130bcb562606d2e841b5f17881aa1e054ba22f67
Reviewed-on: https://chromium-review.googlesource.com/776342
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517353}