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Fix ClassLoader issue of WindowContext
The root cause of this issue is that we pass mClassLoader to new created Resources, but it may be null if we don't set ClassLoader from container. This CL fixes this issue by use ContextImpl#getClassLoader instead. Bug: 203027987 Test: reproducible steps mentioned in bug Change-Id: Ic88a351b3e9bbcf8382b9aefea63e2be2f190cb6