Move WeakPtrFactory member last in class

Move WeakPtrFactory member last in class

It was failing like this:

In file included from ../../media/mojo/services/mojo_cdm_service.cc:5:
../../media/mojo/services/mojo_cdm_service.h:71:40: error: [chromium-style] WeakPtrFactory members which refer to their outer class must be the last member in the outer class definition.
  base::WeakPtrFactory<MojoCdmService> weak_factory_;
                                       ^
BUG=444089
Committed: https://crrev.com/fd1627878734662118298121717c21043b59e1da
Cr-Commit-Position: refs/heads/master@{#313796}

[hans, 2015-01-29 20:45:22]

hans@chromium.org changed reviewers:
+ dalecurtis@chromium.org, dmichael@chromium.org

[hans, 2015-01-29 20:45:23]

This blocks the Clang roll, please take a look.

[DaleCurtis, 2015-01-29 20:52:20]

lgtm

[hans, 2015-01-29 20:56:34]

The CQ bit was checked by hans@chromium.org

[commit-bot: I haz the power, 2015-01-29 20:57:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/872773008/1

[dmichael (off chromium), 2015-01-29 20:57:35]

lgtm too. Surprised this only turned up on the roll.

[commit-bot: I haz the power, 2015-01-29 21:32:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-29 21:33:47]

Patchset 1 (id:??) landed as
https://crrev.com/fd1627878734662118298121717c21043b59e1da
Cr-Commit-Position: refs/heads/master@{#313796}