Remove android_library_loader_hook from content API

Remove android_library_loader_hook from content API

As content_jni_onload.h was added, android_library_loader_hook is not needed be a content API, move it to content/app/android/

BUG=447393
Committed: https://crrev.com/236b82b2ab22b3e35c8d1f3ab51f2d2adf860936
Cr-Commit-Position: refs/heads/master@{#316376}

[michaelbai, 2015-02-13 18:06:59]

michaelbai@chromium.org changed reviewers:
+ jam@chromium.org

[michaelbai, 2015-02-13 18:07:15]

PTAL

[jam, 2015-02-14 00:26:53]

lgtm

[michaelbai, 2015-02-14 01:28:16]

The CQ bit was checked by michaelbai@chromium.org

[commit-bot: I haz the power, 2015-02-14 01:29:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/914083004/1

[commit-bot: I haz the power, 2015-02-14 03:32:35]

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

[commit-bot: I haz the power, 2015-02-14 03:32:35]

Try jobs failed on following builders:
  linux_chromium_asan_rel on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[michaelbai, 2015-02-14 04:21:16]

The CQ bit was checked by michaelbai@chromium.org

[commit-bot: I haz the power, 2015-02-14 04:22:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/914083004/1

[commit-bot: I haz the power, 2015-02-14 05:13:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-14 05:13:39]

Patchset 1 (id:??) landed as
https://crrev.com/236b82b2ab22b3e35c8d1f3ab51f2d2adf860936
Cr-Commit-Position: refs/heads/master@{#316376}