Inline cc.TestFactory() and un-export it. am: e502c1d733 am: a253e2dd5d am: 065fd306fb am: b18c8d059e

Original change: https://android-review.googlesource.com/c/platform/art/+/2193097

Change-Id: If0112034bde3e515d2364e54bd1f4d845dbd3d45
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>