Make View::SchedulePaint() non-virtual
Make View::SchedulePaint() non-virtual

it's implemented in terms of SchedulePaint(gfx::Rect), so need reason
for it to be virtual.

BUG=none
TEST=none
R=ben@chromium.org

Review URL: https://codereview.chromium.org/1843363003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#384368}

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