8c02a22403
This PR removes all usages of the temporary `SemanticsUpdateBuilderNew` API in favor of `SemanticsUpdateBuilder`. These two APIs are the same as of now. This is mainly targeted at https://github.com/flutter/flutter/issues/17988 Steps: part 1: [engine] add `SemanticsUpdateBuilderNew` https://github.com/flutter/engine/pull/47961 part 2: [flutter] use `SemanticsUpdateBuilderNew` https://github.com/flutter/flutter/pull/138331 part 3: [engine] update `SemanticsUpdateBuilder` to be the same as `SemanticsUpdateBuilderNew` https://github.com/flutter/engine/pull/48882 **part 4: [flutter] use (now updated) `SemanticsUpdateBuilder` again** <-- we are here part 5: [engine] remove `SemanticsBuilderNew`