[RLS] Remove unused code in view_painter, ax_object, graphics_layer, and print_context

Now that Root Layer Scrolling (RLS) is enabled by default, we can remove
these unused codepaths.

Bug: 823365
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I212505daa58d1e723cc51c4c764c08822d01da33
Reviewed-on: https://chromium-review.googlesource.com/1065119
Reviewed-by: Steve Kobes <skobes@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559871}
4 files changed