Upgrade to Jasmine 3

This upgrades our version of Jasmine and drops the expectAsync
polyfill we added to compensate in Jasmine 2.  This also drops the
direct dependency on Jasmine, preferring the indirect version expected
by an upgraded version of karma-jasmine.

Closes shaka-project#1949

Change-Id: Ibbdb26e9a20ab9b9d8b152678b65c63feed8633c

package.json

@@ -23,8 +23,7 @@
     "eslint-config-google": "^0.13.0",
     "esprima": "^4.0.1",
     "htmlhint": "^0.11.0",
-    "jasmine-ajax": "^3.3.1",
-    "jasmine-core": "^2.8.0",
+    "jasmine-ajax": "^4.0.0",
     "jsdoc": "github:joeyparrish/jsdoc#45c271fa",
     "karma": "^4.1.0",
     "karma-babel-preprocessor": "^7.0.0",
@@ -33,7 +32,7 @@
     "karma-edge-launcher": "^0.4.2",
     "karma-firefox-launcher": "^1.1.0",
     "karma-ie-launcher": "^1.0.0",
-    "karma-jasmine": "^1.1.0",
+    "karma-jasmine": "^2.0.1",
     "karma-jasmine-ajax": "^0.1.13",
     "karma-opera-launcher": "^1.0.0",
     "karma-safari-launcher": "^1.0.0",