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- MediaRouterDialogDelegate has a WeakPtr to MediaRouterAction, but it
it never set in the ctor. The SetAction() method appears to be never
called. As a result, the WeakPtr is always null. This patch sets action_
in the ctor. Changed expectations in test.

- MediaRouterActionUnitTest setup is incorrect. It should call
MediaRouterTest to have the kEnableMediaRouter switch activated.

- MediaRouterActionUnitTest should only be inlcuded if we are building
Media Router.

BUG=548456

Review URL: https://codereview.chromium.org/1417893005

Cr-Commit-Position: refs/heads/master@{#356978}