Forms: Validation Message bubble should not open during print().

r467941 was a wrong approach because ShouldUsePrintingLayout() returns false
before closing print-preview dialog. We should check Page::Suspended() instead.

BUG=714849

Review-Url: https://codereview.chromium.org/2866193002
Cr-Commit-Position: refs/heads/master@{#470230}
2 files changed