Use longer timeout for tests in CopylessPasteTest

Increasing timeout (https://codereview.chromium.org/2826253004)
lowered the failure rate. This indicates the tests are not inherently
flaky. They just run for longer.

Bug: 713172, 747073
Change-Id: I20a039776aa2aa9f70560e8d688f27ef34e6eb6a
Reviewed-on: https://chromium-review.googlesource.com/580256
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488448}
1 file changed