Chris Bracken 6d8bd99afb
Revert "Reland PerformanceOverlayLayer golden test (#7863)" (#7895)
Reverting this broke the flow tests for the performance overlay:

```
../../flutter/flow/layers/performance_overlay_layer_unittests.cc:70: Failure
Value of: golden_data != nullptr
  Actual: false
Expected: true
```

This reverts commit 8427d73c8340c9e51492689ee66261a4a72cac9e.
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Flow

Flow is a simple compositor based on Skia that the Flutter engine uses to cache recoded paint commands and pixels generated from those recordings. Flow runs on the GPU thread and uploads information to the GPU.