Re-apply "Remove unittest and matcher from the repo."

pkg/matcher/CHANGELOG.md

Index: pkg/matcher/CHANGELOG.md
diff --git a/pkg/matcher/CHANGELOG.md b/pkg/matcher/CHANGELOG.md
deleted file mode 100644
index aaf5a4de54aaee5a6d54b8e8719f083b4be612d6..0000000000000000000000000000000000000000
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+++ /dev/null
@@ -1,55 +0,0 @@
-## 0.11.3+1
-
-* Fix the `prints` matcher test on dart2js.
-
-## 0.11.3
-
-* Add a `prints` matcher that matches output a callback emits via `print`.
-
-## 0.11.2
-
-* Add an `isNotEmpty` matcher.
-
-## 0.11.1+1
-
-* Refactored libraries and tests.
-
-* Fixed spelling mistake.
-
-## 0.11.1
-
-* Added `isNaN` and `isNotNaN` matchers.
-
-## 0.11.0
-
-* Removed deprecated matchers.
-
-## 0.10.1+1
-
-* Get the tests passing when run on dart2js in minified mode.
-
-## 0.10.1
-
-* Compare sets order-independently when using `equals()`.
-
-## 0.10.0+3
-
-* Removed `@deprecated` annotation on matchers due to 
-[Issue 19173](https://code.google.com/p/dart/issues/detail?id=19173)
-
-## 0.10.0+2
-
-* Added types to a number of constants.
-
-## 0.10.0+1
-
-* Matchers related to bad language use have been removed. These represent code
-structure that should rarely or never be validated in tests.
-    * `isAbstractClassInstantiationError`
-    * `throwsAbstractClassInstantiationError`
-    * `isFallThroughError`
-    * `throwsFallThroughError`
-
-* Added types to a number of method arguments.
-
-* The structure of the library and test code has been updated.