[Chromecast] Always receive notifications.

[Chromecast] Always receive notifications.

Call registerToReceiveNotificationsAlways in CastBrowserHelper.
Cast shell expects to receive network notifications at all times to
properly update network state.

R=gunsch@chromium.org
BUG=internal b/20641901

Committed: https://crrev.com/8fbbc669b356f7c25b8c6417738986f5c8525d37
Cr-Commit-Position: refs/heads/master@{#327196}

[derekjchow1, 2015-04-28 00:09:47]

PTAL. Do you think it's worth adding a comment before
NetworkChangeNotifier.init?

[gunsch, 2015-04-28 00:15:32]

BUG=b/20641901

And sure, go ahead and add a comment explaining the purpose. Otherwise lgtm.

[derekjchow1, 2015-04-28 00:23:49]

The CQ bit was checked by derekjchow@chromium.org

[derekjchow1, 2015-04-28 00:23:50]

The patchset sent to the CQ was uploaded after l-g-t-m from gunsch@chromium.org
Link to the patchset: https://codereview.chromium.org/1106363003/#ps40001
(title: "Add comment.")

[commit-bot: I haz the power, 2015-04-28 00:24:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1106363003/40001

[commit-bot: I haz the power, 2015-04-28 00:42:56]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-04-28 00:44:26]

Patchset 3 (id:??) landed as
https://crrev.com/8fbbc669b356f7c25b8c6417738986f5c8525d37
Cr-Commit-Position: refs/heads/master@{#327196}