90b6db8915891e1d910c385cfda768efd5238881
Reverts flutter/engine#50216 Initiated by: zanderso This change reverts the following previous change: Original Description: The `applyRoundingHack` flag is no longer used by the framework. This also removes the [lib/ui/text/line_metrics.h](https://github.com/flutter/engine/pull/50216/files#diff-9175619f2b114dffef67eba38511b34afe6abefd4f697f4758647133895b34f5) file which doesn't seem to be referenced anywhere. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
Description
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