Fix the drp crash for real.

Fix the drp crash for real.

There are 2 different path that can possibly lead to
SetDataReductionProxyEnalbed:
1. AwContents initialization -> InitDataReductionProxyIfNecessary path
2. AwContents statistics SetDataReductionProxyEnalbed JNI path

In both paths, we need to make sure before SetDataReductionProxyEnabed
is called, we have set the statistics object on
DataReductionProxySettings.

BUG=426140
Committed: https://crrev.com/410c610dd19a78841551fcf4b2b9180dc6fa2b85
Cr-Commit-Position: refs/heads/master@{#300730}

[hush (inactive), 2014-10-22 02:12:00]

Patchset #1 (id:1) has been deleted

[hush (inactive), 2014-10-22 02:12:05]

Patchset #1 (id:20001) has been deleted

[hush (inactive), 2014-10-22 02:12:11]

Patchset #1 (id:40001) has been deleted

[hush (inactive), 2014-10-22 02:13:16]

Patchset #1 (id:60001) has been deleted

[hush (inactive), 2014-10-22 02:19:03]

hush@chromium.org changed reviewers:
+ sgurun@chromium.org

[hush (inactive), 2014-10-22 02:19:35]

This CL depends on https://codereview.chromium.org/651443005/
I will rebase later..

[sgurun-gerrit only, 2014-10-22 17:55:02]

lgtm

[hush (inactive), 2014-10-22 18:00:02]

PTAL ps2

[hush (inactive), 2014-10-22 18:00:17]

The CQ bit was checked by hush@chromium.org

[commit-bot: I haz the power, 2014-10-22 18:01:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/671823002/100001

[commit-bot: I haz the power, 2014-10-22 19:27:19]

Committed patchset #2 (id:100001)

[commit-bot: I haz the power, 2014-10-22 19:28:09]

Patchset 2 (id:??) landed as
https://crrev.com/410c610dd19a78841551fcf4b2b9180dc6fa2b85
Cr-Commit-Position: refs/heads/master@{#300730}