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This patch changes inline item and block-level replaced handling in
Element#innerText for improving interrop with adding test cases to WPT test
file.

Examples:
 * abc <img> def => "abc  def"; not collapse spaces around <img>
 * <canvas></canvas> abc => " abc"; not collapse space after <canvas>
 * abc <img style="display:block"> def => "abc\ndef"; recognize block with style

This patch also updates of layout test expectations since existing expectations
were produced by Element#innerText with bug fixed by this patch.

Bug: 894701
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I72d7eec3436d0cfa0226b5efa3adbc4c990f06c5
Reviewed-on: https://chromium-review.googlesource.com/c/1277802
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600671}