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fb7735397e
Issue number: resolves #28827
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## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->
This import was renamed to `IonBackButton` as part of
9f20780d66.
However, we did not consider that some developers are importing this to
use with `ViewChild`. While we should keep alignment with other
component imports, we need to support the old import until we can make a
breaking change in Ionic 8.
## What is the new behavior?
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this PR. -->
- Adds the old IonBackButtonDelegate import
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
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## Other information
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screenshots of how the component looks before and after the change. -->
Dev build: `7.6.5-dev.11705352188.1c6cdb08`