Revert "[LayoutNG] Work around crash with 'text-transform'"

This reverts commit acdd73ae91dbf0374427501eb9c00c89e0a40978.

Reason for revert: editing/selection/mouse/drag_over_text_transform.html fails on mac


Bug: 928739

Original change's description:
> [LayoutNG] Work around crash with 'text-transform'
> 
> 'text-transform' may make LayoutText::GetText() longer than the original
> DOM text node, and result in out-of-range offsets that are not properly
> handled.
> 
> This patch works around that in some crash sites so that it stops
> crashing.
> 
> Bug: 899868
> Change-Id: I55645b83b3d2d0aec38cb2c0f97a2b89a4897d3e
> Reviewed-on: https://chromium-review.googlesource.com/c/1450745
> Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
> Reviewed-by: Koji Ishii <kojii@chromium.org>
> Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
> Reviewed-by: Emil A Eklund <eae@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#628916}

TBR=yosin@chromium.org,eae@chromium.org,yoichio@chromium.org,kojii@chromium.org,xiaochengh@chromium.org

Change-Id: I3aa66f79939a3fd32760db28f3832c31b67a24ae
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 899868
Reviewed-on: https://chromium-review.googlesource.com/c/1454581
Reviewed-by: Florent Castelli <orphis@chromium.org>
Commit-Queue: Florent Castelli <orphis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629131}
5 files changed