fix: require use of new

.gitignore

@@ -10,4 +10,5 @@ system-test/*key.json
 *.lock
 .DS_Store
 google-cloud-logging-winston-*.tgz
-google-cloud-logging-bunyan-*.tgz
+google-cloud-logging-bunyan-*.tgz
+.vscode

src/index.js

@@ -79,10 +79,6 @@ var Image = require('./image.js');
  * });
  */
 function Compute(options) {
-  if (!(this instanceof Compute)) {
-    return new Compute(options);
-  }
-
   options = common.util.normalizeArguments(this, options);
 
   var config = {

test/index.js

@@ -202,12 +202,6 @@ describe('Compute', function() {
       assert(compute instanceof Compute);
     });
 
-    it('should work without new', function() {
-      assert.doesNotThrow(function() {
-        Compute({projectId: PROJECT_ID});
-      });
-    });
-
     it('should normalize the arguments', function() {
       var normalizeArgumentsCalled = false;
       var options = {};