Merge "Update CachingWidgetPreviewLoaderTest members to be non-static. These classes are stubbed by roboelectric so they cannot be static" into sc-dev am: 8fc2d80a32

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15226443

Change-Id: I5a35c7e5f5cf2373c26394b9fd5adb02636f52c0