Revert of Fix paint invalidation and painting for composited-scrolling input elements.

Revert of Fix paint invalidation and painting for composited-scrolling input elements. (patchset #15 id:280001 of https://codereview.chromium.org/2271883002/ )

Reason for revert:
Broke DisplayItemTest.DebugStringsExist on debug probably due to adding a new display item type without updating DisplayItem::typeAsDebugString.

https://uberchromegw.corp.google.com/i/chromium.webkit/builders/WebKit%20Mac10.11%20(dbg)/builds/4251/steps/blink_platform_unittests/logs/DisplayItemTest.DebugStringsExist

Original issue's description:
> Fix paint invalidation and painting for composited-scrolling input elements.
> 
> In, particular, the following issues:
> 
> 1. Paint invalidation missed cases when elements had "intrinsic scrollability",
> in particular input elements.
> 2. Invalidation of carets incorrectly included scrolling for composited input
> elements.
> 3. The DisplayItemClient must be distinct for case #2, because it paints into
> a different GraphicsLayer than the rest of the LayoutBlock.
> 
> BUG=635724
> CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
> 
> Committed: https://crrev.com/b1d694f3370e4b6d6e723382c086617f85c94e93
> Cr-Commit-Position: refs/heads/master@{#415013}

TBR=bokan@chromium.org,pdr@chromium.org,chrishtr@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=635724

[flackr, 2016-08-29 17:00:19]

The CQ bit was checked by flackr@chromium.org

[flackr, 2016-08-29 17:00:20]

Created Revert of Fix paint invalidation and painting for composited-scrolling
input elements.

[flackr, 2016-08-29 17:01:01]

The CQ bit was unchecked by flackr@chromium.org

[chrishtr, 2016-08-29 17:02:54]

Fix is easy, will do that instead.

[flackr, 2016-08-29 17:07:10]

On 2016/08/29 at 17:02:54, chrishtr wrote:
> Fix is easy, will do that instead.

Thanks, closing.