Chris Bracken 459f722b86 Revert "Use iOS scale when computing render buffer size (#4171)" (#4175)
This reverts commit d43d35347594c893687dec7402a525d83f57db10.

Clear regression to the flutter_gallery_ios__transition_perf benchmarks:
  * average_frame_build_time_millis: 1.4x
  * missed_frame_build_budget_count: 1.2x

No regression seen for other iOS benchmarks (e.g. scrolling).
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Flutter Engine

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Flutter is a new way to build high-performance, cross-platform mobile apps. Flutter is optimized for today's, and tomorrow's, mobile devices. We are focused on low-latency input and high frame rates on Android and iOS.

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