Revert of Enable the WebIDL [Exposed] annotation on an interface's members.

Revert of Enable the WebIDL [Exposed] annotation on an interface's members. (https://codereview.chromium.org/424163002/)

Reason for revert:
Causes interactive_ui_tests to timeout

Tests:
WebViewInteractiveTest.PopupPositioningBasic
WebViewInteractiveTest.PopupPositioningMoved

See: http://build.chromium.org/p/chromium.webkit/builders/Linux%20Tests/builds/38370/steps/interactive_ui_tests/logs/stdio

Original issue's description:
> Enable the WebIDL [Exposed] annotation on an interface's members.
> 
> Blink only supports [Exposed] as an interface-level annotation right now,
> but it also makes sense as a member-level annotation in case certain members
> should only be available in a subset of the interface's exposure set.
> 
> The first user for this will be the Web Notifications API, which now
> defines requestPermission() to only be exposed on Document, whereas the rest
> of the API will be available in both windows and workers.
> 
> BUG=398446
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179418

TBR=haraken@chromium.org,jl@opera.com,ch.dumez@samsung.com,bashi@chromium.org,peter@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=398446
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179426

[enne (OOO), 2014-08-01 23:25:08]

Created Revert of Enable the WebIDL [Exposed] annotation on an interface's
members.

[commit-bot: I haz the power, 2014-08-01 23:26:15]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/enne@chromium.org/426583003/1

[commit-bot: I haz the power, 2014-08-01 23:27:48]

Change committed as 179426

[haraken, 2014-08-01 23:39:11]

On 2014/08/01 23:27:48, I haz the power (commit-bot) wrote:
> Change committed as 179426

This CL just changed generated code, and thus won't break
interactive_ui_tests...

[enne (OOO), 2014-08-01 23:43:25]

On 2014/08/01 at 23:39:11, haraken wrote:
> On 2014/08/01 23:27:48, I haz the power (commit-bot) wrote:
> > Change committed as 179426
> 
> This CL just changed generated code, and thus won't break
interactive_ui_tests...

I bisected and reproed this locally.  It seemed to be the culprit.