[Tools] Closure compiler failure on demo-app

[miguelramos]

Bug, feature request, or proposal:

Closure compiler not working or missing docs to how to use it.

What is the expected behavior?

Compile demo app with closure compiler.

What is the current behavior?

Running script for closure compiler trigger errors.

What are the steps to reproduce?

Providing a StackBlitz/Plunker (or similar) is the best way to get the team to see your issue.

Plunker starter (using on @master): https://goo.gl/uDmqyY

StackBlitz starter (using latest npm release): https://goo.gl/wwnhMV

What is the use-case or motivation for changing an existing behavior?

Testing demo app with closure compiler

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular: 5.1.1
Material: latest version
OS: OSX El Capitan - 10.11.6
Typescript: 2.5.3

Is there anything else we should know?

[jelbourn]

Closing this since we're going to revisit Closure Compiler verification once we finish moving to bazel (#8369)

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