Code re-factor related to WeakPtrFactory in src/component module

Code re-factor related to WeakPtrFactory in src/component module

Changing in the initialization order of WeakPtrFactory in src/gin 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 destructor are executed, rendering them invalid.

BUG=303818
Committed: https://crrev.com/1293c75eefdc19ac66a3505d09d6f49aea508373
Cr-Commit-Position: refs/heads/master@{#295439}

[ARUNKK, 2014-09-17 06:32:09]

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

[ARUNKK, 2014-09-17 06:32:09]

PTAL

[Lei Zhang, 2014-09-17 18:37:18]

storage monitor lgtm, but I'm not a policy OWNER

[ARUNKK, 2014-09-18 01:18:43]

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

[commit-bot: I haz the power, 2014-09-18 01:19:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/573133003/1

[commit-bot: I haz the power, 2014-09-18 01:29:53]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-18 01:29:54]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[ARUNKK, 2014-09-18 03:00:34]

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

[ARUNKK, 2014-09-18 03:00:35]

dconnelly@chromium.org: Please review changes in 

PTAL.

[dconnelly, 2014-09-18 08:36:53]

components/policy lgtm

[ARUNKK, 2014-09-18 08:37:56]

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

[ARUNKK, 2014-09-18 08:38:12]

On 2014/09/18 08:36:53, dconnelly wrote:
> components/policy lgtm

Thanks for lgtm.

[commit-bot: I haz the power, 2014-09-18 08:38:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/573133003/1

[commit-bot: I haz the power, 2014-09-18 09:06:29]

Committed patchset #1 (id:1) as 95e84c96e1f7acbf3f16beb91dce54459e7c2742

[commit-bot: I haz the power, 2014-09-18 09:07:14]

Patchset 1 (id:??) landed as
https://crrev.com/1293c75eefdc19ac66a3505d09d6f49aea508373
Cr-Commit-Position: refs/heads/master@{#295439}