[Android] Update path to testing AndroidManifest.xml for GN.

[Android] Update path to testing AndroidManifest.xml for GN.

In https://codereview.chromium.org/1071573003
the testing/android/ directory was moved into
testing/android/native_test/ which broke the
Opus test_opus_padding target. It's built as
part of the 'all' target, which is why it hasn't
been noticed (Android GN bots build chrome_shell_apk).

Committed: https://crrev.com/ac81bcc78bc4a74dc7e4e473c5833d2aad0103df
Cr-Commit-Position: refs/heads/master@{#324836}

[kjellander_chromium, 2015-04-13 09:58:52]

kjellander@chromium.org changed reviewers:
+ jbudorick@chromium.org, jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-04-13 11:05:13]

lgtm

[kjellander_chromium, 2015-04-13 11:18:24]

The CQ bit was checked by kjellander@chromium.org

[commit-bot: I haz the power, 2015-04-13 11:18:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1079963002/1

[commit-bot: I haz the power, 2015-04-13 11:21:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-13 11:22:43]

Patchset 1 (id:??) landed as
https://crrev.com/ac81bcc78bc4a74dc7e4e473c5833d2aad0103df
Cr-Commit-Position: refs/heads/master@{#324836}