Revert of [Media Router] MediaRouterUI + WebUI handler implementation.

Revert of [Media Router] MediaRouterUI + WebUI handler implementation. (patchset #9 id:160001 of https://codereview.chromium.org/1139203003/)

Reason for revert:
Causing failures: https://code.google.com/p/chromium/issues/detail?id=493525

Original issue's description:
> [Media Router] MediaRouterUI + WebUI handler implementation.
>
> This patch has two parts:
> - MediaRouterWebUIMessageHandler handles calls coming
> from WebUI/JS. Also sends up-to-date data (e.g. MediaSinks)
> to WebUI.
> - MediaRouterUI interfaces with the MediaRouter to handle calls
> from the WebUI (such as CreateRoute) and listen for sink /
> route updates.
>
> Implemented handler logic for the following from Media Router WebUI:
>
> OnGetInitialSettings
> OnCreateRoute
> OnActOnIssue - skeleton impl
> OnCloseRoute
> OnCloseDialog
>
> Implemented WebUI logic for the following (to update the UI):
> UpdateSinks
> UpdateRoutes
> UpdateCastModes
> AddRoute
> UpdateIssue - skeleton impl
>
> Some Issues related APIs are left unimplemented until more resources
> have been upstreamed.
>
> BUG=464216, 464208
>
> Committed: https://crrev.com/bcb07449ce226e9263cf4f2637a1656377782e17
> Cr-Commit-Position: refs/heads/master@{#331905}

TBR=wez@chromium.org,imcheng@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=464216, 464208
Committed: https://crrev.com/9d16592929f9e12eb7d154d59fee517fcf4c917d
Cr-Commit-Position: refs/heads/master@{#331919}

[dmurph, 2015-05-29 03:13:00]

Created Revert of [Media Router] MediaRouterUI + WebUI handler implementation.

[commit-bot: I haz the power, 2015-05-29 03:13:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162693002/1

[commit-bot: I haz the power, 2015-05-29 03:14:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-29 03:15:04]

Patchset 1 (id:??) landed as
https://crrev.com/9d16592929f9e12eb7d154d59fee517fcf4c917d
Cr-Commit-Position: refs/heads/master@{#331919}