Revert of [Streams] Make ReadableStreamReader NoInterfaceObject.

Revert of [Streams] Make ReadableStreamReader NoInterfaceObject. (patchset #1 id:1 of https://codereview.chromium.org/1060773002/)

Reason for revert:
The change was committed after the branch and I will create a change that will include this one to merge.


Original issue's description:
> [Streams] Make ReadableStreamReader NoInterfaceObject.
> 
> BUG=393911
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=193154

TBR=horo@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=393911
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=193317

[yhirano, 2015-04-08 01:56:40]

Created Revert of [Streams] Make ReadableStreamReader NoInterfaceObject.

[commit-bot: I haz the power, 2015-04-08 01:56:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1064323002/1

[commit-bot: I haz the power, 2015-04-08 01:57:24]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=193317

[yhirano, 2015-04-10 03:53:33]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1077003002/ by yhirano@chromium.org.

The reason for reverting is: The plan mentioned at the revert description
changed..