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'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}