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80cd050cae
Trying to migrate the iOS embedder MRC to ARC, I'm attempting to break some dependency cycles so it's easier to migrate the "leaf" dependencies to ARC, working my way up.
The cycle is:
**`FlutterViewController`** -> `FlutterView` -> `FlutterPlatformView` -> (Before this PR)**`FlutterViewController`**
`FlutterViewController` depends on many other large MRC classes, like FlutterEngine., so I'd like to pull that one out so `FlutterView`, `FlutterPlatformView`, and `FlutterOverlayView` can be migrated to ARC in a smaller PR.
`FlutterPlatformView` only depends on `FlutterViewController` in this one place, casting a `UIViewController` and calling `-forceTouchesCancelled:`.
0e6143504c/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews.mm (L1201)
Instead, move `-forceTouchesCancelled:` to the existing `FlutterViewResponder` protocol with the other touch events, which `FlutterViewController` already implements. The cast can then be removed, breaking the cycle.
Clean up all the imports.
Part of https://github.com/flutter/flutter/issues/137801, though this doesn't actually migrate anything to ARC.