Declaring the weak_ptr_factory in proper order in src/cc.

Declaring the weak_ptr_factory in proper order in src/cc.

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/03fd39760cfd31da392e596be40fd06c9eff6bf6
Cr-Commit-Position: refs/heads/master@{#295279}

[ARUNKK, 2014-09-17 07:10:17]

kulkarni.a@samsung.com changed reviewers:
+ reveman@chromium.org

[ARUNKK, 2014-09-17 07:10:18]

PTAL.

[reveman, 2014-09-17 14:32:36]

lgtm

[ARUNKK, 2014-09-17 14:33:19]

The CQ bit was checked by kulkarni.a@samsung.com

[commit-bot: I haz the power, 2014-09-17 14:33:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/581563002/1

[commit-bot: I haz the power, 2014-09-17 15:42:39]

Committed patchset #1 (id:1) as 9120faec7e493892345b4bad9f3105439f01ce63

[commit-bot: I haz the power, 2014-09-17 15:43:33]

Patchset 1 (id:??) landed as
https://crrev.com/03fd39760cfd31da392e596be40fd06c9eff6bf6
Cr-Commit-Position: refs/heads/master@{#295279}