[Files.app] Fix the licence error of audio_player_scripts.js

This patch fixes the build failure of the 'check_licenses' test in 'Android Builder (dbg)'.

Major changes:
- Modify the year in the copyright string in audio_player_scripts.js
- Put audio_player_scripts.js into the whitelist

BUG=none
TEST=manually run android_webview/tools/webview_licenses.py scan
TBR=boliu@chromium.org, yoshiki@chromium.org

Review URL: https://codereview.chromium.org/150143002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247896 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247896