This reverts commit 85bfc4c5.

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wasm was removed in a recent Dart roll
(https://github.com/flutter/engine/commit/8d332b7ae3205e33e0c7a9b16bb5a04abc9e786f)

This reverts commit 2004a7b3.

https://dart.googlesource.com/sdk.git/+log/5ea7e4d39f43..6a805f4dbcf4

2020-11-14 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.12.0-43.0.dev

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dart-lang/sdk@ 5ea7e4d39f4 (tag: 2.12.0-42.0.dev, origin/dev) Version 2.12.0-42.0.dev
dart-lang/sdk@ 504e9a32f91 Reland "[wasm] Remove dart:wasm"
dart-lang/sdk@ 9814efb19c7 [standalone] Update tcmalloc to 2.8.
dart-lang/sdk@ 1d05591fbb1 [vm] Produce clearer error messages when operator new fails.
dart-lang/sdk@ 82637793bf0 [dart2js] List.generate tweaks
dart-lang/sdk@ 3103e1e0f66 Migration: don't overcount "whereOrNull" fixes.

https://dart.googlesource.com/sdk.git/+log/bf20abbb8e22..7bbace20d14f

2020-11-13 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.12.0-41.0.dev

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Changes to make this work:

- Had to change the use of an UBool constant `FALSE` to 0 because
  the file referring to it does not include the respective header.

- Had to change the license checker to ignore files in the directory
  icu/source/samples.  There were random changes to the licensing
  headers which tripped up license checks.  And since we don't include
  samples in the binaries we build, the most efficient way to fix it is
  to exclude sample code from license checks.

Issue: https://github.com/flutter/flutter/issues/70370

This removes the Window class, now that the framework no longer uses it.