Avoid using FlutterError.fromParts when possible #43696
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Description
This PR is a follow up of https://github.com/flutter/flutter/pull/42640/files
Some changes of that PR includes redundant changes using FlutterError.fromParts constructor even though it's not necessary
Some minor changes are:
Related Issues
none
Tests
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