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This patch wanted to confirm changing selection invalidation
between execCommand("selectAll") and Selection.setBaseAndExtent().
However calling execCommand("selectAll") before load is flaky from
the point of invalidation.

This patch arranges the function calls so that invalidation occurs
only on selection difference w/o flakiness.

Bug: 774437
Change-Id: I63efe553282f4a6643c0d7b8eb0b0597b1ccac9f
Reviewed-on: https://chromium-review.googlesource.com/1025594
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553892}