This leak is completely similar to #54275

The issue is the MouseCursorPlugin leaks the FlutterView. A similar fix to #54275 will be needed for this one too.

[✓] Flutter (Channel beta, 1.19.0-4.1.pre, on Mac OS X 10.15.5 19F101, locale en-US)
• Flutter version 1.19.0-4.1.pre at /Users/danny.valente/Library/flutter/1.19.0-4.1.pre-beta
• Framework revision f994b76 (5 weeks ago), 2020-06-09 15:53:13 -0700
• Engine revision 9a28c3bcf4
• Dart version 2.9.0 (build 2.9.0-14.1.beta)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at /Users/danny.valente/Library/Android/sdk
• Platform android-29, build-tools 29.0.2
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.4.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.4.1, Build version 11E503a
• CocoaPods version 1.9.3

[✓] Android Studio (version 4.0)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 47.1.2
• Dart plugin version 193.7361
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)