Remove the usage of resolver as function in registry

packages/container/lib/registry.js

@@ -24,10 +24,6 @@ export default class Registry {
     this.fallback = options.fallback || null;
     this.resolver = options.resolver || null;
 
-    if (typeof this.resolver === 'function') {
-      deprecateResolverFunction(this);
-    }
-
     this.registrations = dictionary(options.registrations || null);
 
     this._typeInjections        = dictionary(null);
@@ -602,15 +598,6 @@ export default class Registry {
   }
 }
 
-function deprecateResolverFunction(registry) {
-  deprecate(
-    'Passing a `resolver` function into a Registry is deprecated. Please pass in a Resolver object with a `resolve` method.',
-    false,
-    { id: 'ember-application.registry-resolver-as-function', until: '3.0.0', url: 'https://emberjs.com/deprecations/v2.x#toc_registry-resolver-as-function' }
-  );
-  registry.resolver = { resolve: registry.resolver };
-}
-
 if (DEBUG) {
   Registry.prototype.normalizeInjectionsHash = function(hash) {
     let injections = [];

packages/container/tests/registry_test.js

@@ -473,22 +473,6 @@ QUnit.test('`knownForType` is called on the resolver if present', function() {
   });
 });
 
-QUnit.test('A registry can be created with a deprecated `resolver` function instead of an object', function() {
-  expect(2);
-
-  let registry;
-
-  expectDeprecation(() => {
-    registry = new Registry({
-      resolver(fullName) {
-        return `${fullName}-resolved`;
-      }
-    });
-  }, 'Passing a `resolver` function into a Registry is deprecated. Please pass in a Resolver object with a `resolve` method.');
-
-  equal(registry.resolve('foo:bar'), 'foo:bar-resolved', '`resolve` still calls the deprecated function');
-});
-
 QUnit.test('resolver.expandLocalLookup is not required', function(assert) {
   assert.expect(1);