Fix a bug in UserScriptLoader.

Fix a bug in UserScriptLoader.

1. Fix a misuse of a released pointer in UserScriptLoader;
2. Add initilaztions for the variables that will be picked in UserScript.

BUG=461052
Committed: https://crrev.com/0237e7bb40c9ce7b194564c8c7815521b17a30b1
Cr-Commit-Position: refs/heads/master@{#319329}

[Xi Han, 2015-03-05 20:03:41]

Patchset #1 (id:1) has been deleted

[Xi Han, 2015-03-05 20:13:48]

hanxi@chromium.org changed reviewers:
+ rdevlin.cronin@chromium.org

[Xi Han, 2015-03-05 20:13:48]

Hi Devlin, a simple patch that fixes a bug in UserScriptLoader. PTAL, thanks!

[Devlin, 2015-03-05 20:18:38]

lgtm

https://codereview.chromium.org/982113002/diff/20001/extensions/browser/user_...
File extensions/browser/user_script_loader.cc (right):

https://codereview.chromium.org/982113002/diff/20001/extensions/browser/user_...
extensions/browser/user_script_loader.cc:450: if (user_scripts_ &&
!user_scripts_->empty() &&
D'oh.

https://codereview.chromium.org/982113002/diff/20001/extensions/common/user_s...
File extensions/common/user_script.cc (right):

https://codereview.chromium.org/982113002/diff/20001/extensions/common/user_s...
extensions/common/user_script.cc:84: host_id_(HostID()),
Default constructors are automatically called; you don't need these.

[Xi Han, 2015-03-05 20:26:24]

https://codereview.chromium.org/982113002/diff/20001/extensions/common/user_s...
File extensions/common/user_script.cc (right):

https://codereview.chromium.org/982113002/diff/20001/extensions/common/user_s...
extensions/common/user_script.cc:84: host_id_(HostID()),
On 2015/03/05 20:18:38, Devlin wrote:
> Default constructors are automatically called; you don't need these.

Remove initializations for both host_id and routing_info.

[Xi Han, 2015-03-05 20:26:32]

The CQ bit was checked by hanxi@chromium.org

[Xi Han, 2015-03-05 20:26:33]

The patchset sent to the CQ was uploaded after l-g-t-m from
rdevlin.cronin@chromium.org
Link to the patchset: https://codereview.chromium.org/982113002/#ps40001 (title:
"nits")

[commit-bot: I haz the power, 2015-03-05 20:27:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/982113002/40001

[commit-bot: I haz the power, 2015-03-05 21:26:15]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-03-05 21:26:54]

Patchset 2 (id:??) landed as
https://crrev.com/0237e7bb40c9ce7b194564c8c7815521b17a30b1
Cr-Commit-Position: refs/heads/master@{#319329}