Bug 724632 - Detraitify sdk/content/loader.

```sh
(addon-sdk)➜  ~CFX_ROOT  (detraitify-content-loader) cfx test -b /Applications/FirefoxNightly.app -f content-loader
Warning: missing module: resource://gre/modules/Preferences.jsm
Warning: missing module: ../../framescript/FrameScriptManager.jsm
Warning: missing module: ../framescript/FrameScriptManager.jsm
Warning: missing module: resource://gre/modules/AddonManager.jsm
Using binary at '/Applications/FirefoxNightly.app/Contents/MacOS/firefox-bin'.
Using profile at '/var/folders/0z/nztt5n4d4kg7b43dg9nv_3fc0000gp/T/tmp8ohAaD.mozrunner'.
Running tests on Firefox 36.0a1/Gecko 36.0a1 ({ec8030f7-c20a-464f-9b0e-13a3a9e97384}) under darwin/x86_64.
..........................................
42 of 42 tests passed.
Total time: 4.795490 seconds
Program terminated successfully.
(addon-sdk)➜  ~CFX_ROOT  (detraitify-content-loader)
```