Merge "Update CachingWidgetPreviewLoaderTest members to be non-static. These...

Merge "Update CachingWidgetPreviewLoaderTest members to be non-static. These classes are stubbed by roboelectric so they cannot be static" into sc-dev am: 8fc2d80a

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

Change-Id: I8679f541141ba48d66d7499fead7eb2921d32dfa