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Before this CL, LocalNTPTest.EmbeddedSearchAPIAfterDownload stored a
test download file into the system's actual downloads folder, and left
it there after the test ended. This CL instead sets up a temporary
folder as the download folder.

Bug: 592273
Change-Id: I27aa103b4c69b7c6a6bba755f74ee0bcb9fe2c84
Reviewed-on: https://chromium-review.googlesource.com/814115Reviewed-by: Chris Pickel <sfiera@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522424}