drop angular (#1812)

Remove support for `@ngInject` as there are proper alternatives anyway.

test/compress/angular-inject.js

@@ -1,67 +0,0 @@
-ng_inject_defun: {
-    options = {
-        angular: true
-    };
-    input: {
-        /*@ngInject*/
-        function Controller(dependency) {
-            return dependency;
-        }
-    }
-    expect: {
-        function Controller(dependency) {
-            return dependency;
-        }
-        Controller.$inject=['dependency']
-    }
-}
-
-ng_inject_assignment: {
-    options = {
-        angular: true
-    };
-    input: {
-        /*@ngInject*/
-        var Controller = function(dependency) {
-            return dependency;
-        }
-    }
-    expect: {
-        var Controller = function(dependency) {
-            return dependency;
-        }
-        Controller.$inject=['dependency']
-    }
-}
-
-ng_inject_inline: {
-    options = {
-        angular: true
-    };
-    input: {
-        angular.module('a').
-            factory('b',
-                /*@ngInject*/
-                function(dependency) {
-                    return dependency;
-                }).
-            directive('c',
-                /*@ngInject*/
-                function(anotherDependency) {
-                    return anotherDependency;
-                })
-    }
-    expect: {
-        angular.module('a').
-            factory('b',[
-                'dependency',
-                function(dependency) {
-                    return dependency;
-                }]).
-            directive('c',[
-                'anotherDependency',
-                function(anotherDependency) {
-                    return anotherDependency;
-                }])
-    }
-}