[deps] remove the package:usage dep from the sdk

Change-Id: I1ff70767f686e3ec7635294e80fbdb0137e938ee
Tested: pubspec only change to remove a no-longer-used dep
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/365920
Reviewed-by: Kevin Moore <kevmoo@google.com>
Commit-Queue: Devon Carew <devoncarew@google.com>
diff --git a/DEPS b/DEPS
index 7db601a..92dde43 100644
--- a/DEPS
+++ b/DEPS
@@ -188,7 +188,6 @@
   "test_reflective_loader_rev": "537ab5b24632c03918fb229531cfb41946eeae27",
   "tools_rev": "d35d633e6df04f8a60a305a36437f67f9fefca5d",
   "typed_data_rev": "5b3708eb633593b30868871301e8e15d344d7585",
-  "usage_rev": "bc4907bca87e2ef5e9ee80e1bef7ee57f5cbc6d2",
   "vector_math_rev": "43f2a77bb0be812b027a68a11792d563713b42a1",
   "watcher_rev": "42308ea9e22bc2d1edab497ee58c0df0affbfed0",
   "web_rev": "ff7185c6c0360987116115039a08d9134c8d62aa",
@@ -517,8 +516,6 @@
       Var("dart_git") + "tools.git" + "@" + Var("tools_rev"),
   Var("dart_root") + "/third_party/pkg/typed_data":
       Var("dart_git") + "typed_data.git" + "@" + Var("typed_data_rev"),
-  Var("dart_root") + "/third_party/pkg/usage":
-      Var("dart_git") + "usage.git" + "@" + Var("usage_rev"),
   Var("dart_root") + "/third_party/pkg/vector_math":
       Var("dart_git") + "external/github.com/google/vector_math.dart.git" +
       "@" + Var("vector_math_rev"),
diff --git a/runtime/observatory/pubspec.yaml b/runtime/observatory/pubspec.yaml
index 8a8d572..492e1cb 100644
--- a/runtime/observatory/pubspec.yaml
+++ b/runtime/observatory/pubspec.yaml
@@ -1,9 +1,9 @@
 name: observatory
+
 environment:
   sdk: '>=2.19.0 <3.0.0'
 
-dependencies:
-  usage: any
+# dependencies:
 
 dev_dependencies:
   build_runner: '>=1.6.2 <2.0.0'