Revert 291286: broke 'ExtensionOptionsApiTest.ExtensionCanEmbedOwnOptions'.

Revert 291286: broke 'ExtensionOptionsApiTest.ExtensionCanEmbedOwnOptions'.

The test is failing on all platforms with the following error message:
"[FAIL] createGuestViewDOM: uncaught exception: Error in event handler for extensionOptionsInternal.onSizeChanged: Invocation of form guestViewInternal.setAutoSize(undefined, object) doesn't match definition guestViewInternal.setAutoSize(integer instanceId, object params)
Stack trace: Error: Invocation of form guestViewInternal.setAutoSize(undefined, object) doesn't match definition guestViewInternal.setAutoSize(integer instanceId, object params)
    at Object.normalizeArgumentsAndValidate (extensions::schemaUtils:113:11)
    at Object.\u003Canonymous> (extensions::binding:326:30)
    at ExtensionOptionsInternal.resize (extensions::extensionOptions:178:21)
    at ExtensionOptionsInternal.onSizeChanged (extensions::extensionOptions:153:10)
    at ExtensionOptionsEvents.handleSizeChangedEvent (extensions::extensionOptionsEvents:66:33)
    at Object.EXTENSION_OPTIONS_EVENTS.sizechanged.customHandler (extensions::extensionOptionsEvents:20:15)
    at info.evt.addListener.instanceId (extensions::extensionOptionsEvents:55:12)
    at EventImpl.dispatchToListener (extensions::event_bindings:397:22)
    at Event.publicClass.(anonymous function) [as dispatchToListener] (extensions::utils:94:26)
    at EventImpl.dispatch_ (extensions::event_bindings:379:35)
Error
    at extensions::test:93:22
    at exports.handle (extensions::uncaught_exception_handler:15:3)
    at EventImpl.dispatch_ (extensions::event_bindings:384:9)
    at dispatchArgs (extensions::event_bindings:247:26)
    at dispatchEvent (extensions::event_bindings:256:7)", source: chrome-extension://obocclgnomgjhjnenilbpmgkgfmdhecn/test.html (0)

> Implement smoother autosizing of the extension options overlay
>
>  - Use element.animate to resize the overlay for embedded extension
>    options. When an <extensionoptions> element is embedded in a WebUI
>    overlay, if its size changes the overlay will smoothly expand to
>    surround the element.
>  - Add an API to <extensionoptions> to defer autosizing until its
>    embedder is ready. This is used to 'pin' the element's size until
>    the overlay is done expanding.
>  - Move the <extensionoptions> off screen until the overlay is done
>    expanding.
>  - Prevent <extensionoptions> from shrinking after the initial sizing.
>    This makes the look of the embedded options page more consistent.
>
> BUG=386842
>
> Review URL: https://codereview.chromium.org/480243003

TBR=ericzeng@chromium.org

Review URL: https://codereview.chromium.org/498633002

Cr-Commit-Position: refs/heads/master@{#291328}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291328 0039d316-1c4b-4281-b951-d872f2087c98