Utilize selection_test() in editing/selection/doubleclick-beside-cr-span.html

This patch changes "doubleclick-beside-cr-span.html" to utilize
|selection_test()| for ease of maintenance and help to implementing EditingNG.

Bug: 707656, 679977
Change-Id: Ibee76fe9911b05e394e750e9d4effece1a9941d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2215871
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Auto-Submit: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772554}

third_party/blink/web_tests/editing/selection/doubleclick-beside-cr-span-expected.txt

-This tests that double-clicking a word that follows newline and span
-
-cases for white-space: pre
-
-Note: Here for pre, we change width value to 200 to prevent layout change on contentEditable enabled.
-
-cases for white-space: pre-wrap
-cases for white-space: pre-line
-cases for white-space: nowrap
-
-Note: Although following cases have no line-breaks that had caused problem reported bug28036, we add these for comprehensiveness.
-
-Passed totest_minimum
-Passed totest_minimum (with contentEditable)
-Passed totest_before_after
-Passed totest_before_after (with contentEditable)
-Passed totest_linebreak_out
-Passed totest_linebreak_out (with contentEditable)
-Passed totest_tab_out
-Passed totest_tab_out (with contentEditable)
-Passed totest_multiple_whitespaces_out
-Passed totest_multiple_whitespaces_out (with contentEditable)
-Passed totest_linebreak_in
-Passed totest_linebreak_in (with contentEditable)
-Passed totest_tab_in
-Passed totest_tab_in (with contentEditable)
-Passed totest_multiple_whitespaces_in
-Passed totest_multiple_whitespaces_in (with contentEditable)
-Passed totest_multiple_word_in_span
-Passed totest_multiple_word_in_span (with contentEditable)
-Passed totest_word_before_here_in_line
-Passed totest_word_before_here_in_line (with contentEditable)
-Passed totest_span_first_half
-Passed totest_span_first_half (with contentEditable)
-Passed totest_span_second_half
-Passed totest_span_second_half (with contentEditable)
-Passed totest_linebreak_out_pre
-Passed totest_linebreak_out_pre (with contentEditable)
-Passed totest_tab_out_pre
-Passed totest_tab_out_pre (with contentEditable)
-Passed totest_multiple_whitespaces_out_pre
-Passed totest_multiple_whitespaces_out_pre (with contentEditable)
-Passed totest_linebreak_in_pre
-Passed totest_linebreak_in_pre (with contentEditable)
-Passed totest_tab_in_pre
-Passed totest_tab_in_pre (with contentEditable)
-Passed totest_multiple_whitespaces_in_pre
-Passed totest_multiple_whitespaces_in_pre (with contentEditable)
-Passed totest_linebreak_out_prewrap
-Passed totest_linebreak_out_prewrap (with contentEditable)
-Passed totest_tab_out_prewrap
-Passed totest_tab_out_prewrap (with contentEditable)
-Passed totest_multiple_whitespaces_out_prewrap
-Passed totest_multiple_whitespaces_out_prewrap (with contentEditable)
-Passed totest_linebreak_in_prewrap
-Passed totest_linebreak_in_prewrap (with contentEditable)
-Passed totest_tab_in_prewrap
-Passed totest_tab_in_prewrap (with contentEditable)
-Passed totest_multiple_whitespaces_in_prewrap
-Passed totest_multiple_whitespaces_in_prewrap (with contentEditable)
-Passed totest_linebreak_out_preline
-Passed totest_linebreak_out_preline (with contentEditable)
-Passed totest_tab_out_preline
-Passed totest_tab_out_preline (with contentEditable)
-Passed totest_multiple_whitespaces_out_preline
-Passed totest_multiple_whitespaces_out_preline (with contentEditable)
-Passed totest_linebreak_in_preline
-Passed totest_linebreak_in_preline (with contentEditable)
-Passed totest_tab_in_preline
-Passed totest_tab_in_preline (with contentEditable)
-Passed totest_multiple_whitespaces_in_preline
-Passed totest_multiple_whitespaces_in_preline (with contentEditable)
-Passed totest_linebreak_out_nowrap
-Passed totest_linebreak_out_nowrap (with contentEditable)
-Passed totest_tab_out_nowrap
-Passed totest_tab_out_nowrap (with contentEditable)
-Passed totest_multiple_whitespaces_out_nowrap
-Passed totest_multiple_whitespaces_out_nowrap (with contentEditable)
-Passed totest_linebreak_in_nowrap
-Passed totest_linebreak_in_nowrap (with contentEditable)
-Passed totest_tab_in_nowrap
-Passed totest_tab_in_nowrap (with contentEditable)
-Passed totest_multiple_whitespaces_in_nowrap
-Passed totest_multiple_whitespaces_in_nowrap (with contentEditable)
-