Allow Raw Input gamepads to persist across page refreshes

Allow Raw Input gamepads to persist across page refreshes

The problem was that we were clearing the controller collection when
pausing input, but only repopulating it when the connected device list
changed (a device was connected or removed). Now we only clear the list
on device list changed events or when the RawInputDataFetcher is deleted.

Also fixed an error windows was throwing that indicated we were passing
the wrong parameters to RegisterRawInputDevices when pausing input
monitoring.

BUG=413805
Committed: https://crrev.com/45793258429d8e260a6e025b2e4c8ff4a1bd53f5
Cr-Commit-Position: refs/heads/master@{#327603}

[bajones, 2015-04-29 21:29:12]

bajones@chromium.org changed reviewers:
+ scottmg@chromium.org

[bajones, 2015-04-29 21:29:12]

PTAL

[scottmg, 2015-04-29 21:45:33]

lgtm

[bajones, 2015-04-29 21:49:12]

The CQ bit was checked by bajones@chromium.org

[commit-bot: I haz the power, 2015-04-29 21:50:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1113913003/1

[commit-bot: I haz the power, 2015-04-29 22:50:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-29 22:52:42]

Patchset 1 (id:??) landed as
https://crrev.com/45793258429d8e260a6e025b2e4c8ff4a1bd53f5
Cr-Commit-Position: refs/heads/master@{#327603}