Make Serializer in assert_selection() not to use anchor/focus of empty selection
This patch changes |Serializer| class in |assert_selection()| not to use
anchor/focus positions of empty selection to avoid |console.assert()| in
|SampleSelection| getters.
This is follow-up patch for http://crrev.com/403433, which makes
|assert_selection()| to support empty selection result.
BUG=n/a
TEST=n/a; no behavior changes
Review-Url: https://codereview.chromium.org/2133043002
Cr-Commit-Position: refs/heads/master@{#405730}
1 file changed
