Summary:
When debugging closeable reference leaks, I found that the Flipper plugin doesn't properly close one:
```
2020-01-17 10:45:29.346 27038-27053/com.facebook.wakizashi D/YOLO: LEAK!!:
java.lang.Throwable
at com.facebook.common.references.CloseableReference.<init>(CloseableReference.java:158)
at com.facebook.common.references.DefaultCloseableReference.<init>(DefaultCloseableReference.java:29)
at com.facebook.common.references.CloseableReference.of(CloseableReference.java:237)
at com.facebook.common.references.CloseableReference.of(CloseableReference.java:203)
at com.facebook.common.references.CloseableReference.of(CloseableReference.java:176)
at com.facebook.imagepipeline.cache.CountingMemoryCache.newClientReference(CountingMemoryCache.java:221)
at com.facebook.imagepipeline.cache.CountingMemoryCache.get(CountingMemoryCache.java:209)
at com.facebook.flipper.plugins.fresco.FrescoFlipperPlugin$4.onReceive(FrescoFlipperPlugin.java:204)
at com.facebook.flipper.android.EventBase.loopForever(Native Method)
at com.facebook.flipper.android.FlipperThread.run(FlipperThread.java:31)
```
Second leak:
```
2020-01-17 11:04:16.503 28855-28869/com.facebook.wakizashi D/YOLO: LEAK!!:
java.lang.Throwable
at com.facebook.common.references.CloseableReference.<init>(CloseableReference.java:147)
at com.facebook.common.references.DefaultCloseableReference.<init>(DefaultCloseableReference.java:21)
at com.facebook.common.references.DefaultCloseableReference.clone(DefaultCloseableReference.java:35)
at com.facebook.common.references.CloseableReference.cloneOrNull(CloseableReference.java:258)
at com.facebook.common.references.CloseableReference.cloneOrNull(CloseableReference.java:326)
at com.facebook.imagepipeline.cache.CountingMemoryCacheInspector$DumpInfoEntry.<init>(CountingMemoryCacheInspector.java:32)
at com.facebook.imagepipeline.cache.CountingMemoryCacheInspector.dumpCacheContent(CountingMemoryCacheInspector.java:101)
at com.facebook.flipper.plugins.fresco.FrescoFlipperPlugin$3.onReceive(FrescoFlipperPlugin.java:171)
at com.facebook.flipper.android.EventBase.loopForever(Native Method)
at com.facebook.flipper.android.FlipperThread.run(FlipperThread.java:31)
```
Reviewed By: passy
Differential Revision: D19445902
fbshipit-source-id: 12a513d9e34fcac0d546a4eac55932956e4e4d5b