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Change ChromeDriver build bot setting for Windows, to generate
full symbols.

Change-Id: I31ea9abd5ff619f12f15da8ef46ad01590f162a3
Reviewed-on: https://chromium-review.googlesource.com/994735Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547984}