Remove globals that are now unnecessary thanks to the use of various ESLint environments (e.g. Node, ShellJS, Jasmine)

src/core/worker.js

@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals NetworkManager, module */
+/* globals module */
 
 'use strict';
 

src/display/canvas.js

@@ -12,7 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals ImageData */
 
 'use strict';
 

src/display/font_loader.js

@@ -12,7 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals FontFace */
 
 'use strict';
 

src/display/metadata.js

@@ -12,7 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals Document */
 
 'use strict';
 

src/display/text_layer.js

@@ -12,7 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals WeakMap */
 
 'use strict';
 

src/shared/util.js

@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals URL, global */
+/* globals global */
 
 'use strict';