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I was hoping this would remove
NativeLibraries.getTestRunnerClassNameForTesting()
but it doesn't look like it does :(.

Still - this way of creating the file brings it in line with how
we create R.java and BuildConfig.java.

Bug: 984573
Change-Id: Iebeaa9970ac9c47ea13f81f05b71d5ccb5247205
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1704315
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678569}