Fix WeakPtrFactory member placement.

Fix WeakPtrFactory member placement.

Changing in the intialization order of WeakPtrFactory in src/extensions module
such that all member variables should appear before the WeakPtrFactory
to ensure that any WeakPtrs to Controller are invalidated before its members
variable's destructors are executed, rendering them invalid.

BUG=303818
Committed: https://crrev.com/bb1951228bfc4c44e649f00d9a42c3d142a7227f
Cr-Commit-Position: refs/heads/master@{#294743}

[anujsharma, 2014-09-13 10:44:11]

anujk.sharma@samsung.com changed reviewers:
+ fsamuel@chromium.org

[anujsharma, 2014-09-13 10:44:26]

On 2014/09/13 10:44:12, anujsharma wrote:

PTAL

[Fady Samuel, 2014-09-13 11:46:12]

lgtm

[anujsharma, 2014-09-13 11:47:28]

The CQ bit was checked by anujk.sharma@samsung.com

[commit-bot: I haz the power, 2014-09-13 11:47:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/573513002/1

[anujsharma, 2014-09-13 11:47:55]

On 2014/09/13 11:46:12, Fady Samuel wrote:
> lgtm

Thanks fady for LGTM.

[commit-bot: I haz the power, 2014-09-13 12:46:20]

Committed patchset #1 (id:1) as 57b7925aef8aeaa1e1e8e17a6995cc83acf2955f

[commit-bot: I haz the power, 2014-09-13 12:48:22]

Patchset 1 (id:??) landed as
https://crrev.com/bb1951228bfc4c44e649f00d9a42c3d142a7227f
Cr-Commit-Position: refs/heads/master@{#294743}