Revert of [src/chrome/browser/] Declaring the weak_ptr_factory in proper order in ui and prerender …

Revert of [src/chrome/browser/] Declaring the weak_ptr_factory in proper order in ui and prerender (patchset #1 id:1 of https://codereview.chromium.org/612783003/)

Reason for revert:
Author ignored review comments from multiple reviewers and failed to fix or revert his change after repeated inquiries as to why.

Original issue's description:
> [src/chrome/browser/] Declaring the weak_ptr_factory in proper order in ui and prerender
>
> Cleaning up weak_ptr_factory destruction order.
> WeakPtrFactory should remain the last member so it'll be destroyed and
> invalidate its weak pointers before any other members are destroyed.
>
> BUG=303818
>
> Committed: https://crrev.com/5c10e8618bb1c326b18395224b46c41f60867b30
> Cr-Commit-Position: refs/heads/master@{#299059}

TBR=cbentzel@chromium.org,dcheng@chromium.org,kulkarni.a@samsung.com
NOTREECHECKS=true
NOTRY=true
BUG=303818
Committed: https://crrev.com/f7023d2af7b7ad852caca2335c32341192d7e442
Cr-Commit-Position: refs/heads/master@{#299787}

[Peter Kasting, 2014-10-15 23:31:43]

The CQ bit was checked by pkasting@chromium.org

[commit-bot: I haz the power, 2014-10-15 23:32:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/658943002/1

[commit-bot: I haz the power, 2014-10-15 23:35:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-15 23:36:22]

Patchset 1 (id:??) landed as
https://crrev.com/f7023d2af7b7ad852caca2335c32341192d7e442
Cr-Commit-Position: refs/heads/master@{#299787}