Revert of [AudioPlayer] Add test for opening another file from Files.app (https://codereview.chromium.org/177443006/)

Reason for revert:
This CL seems to be making OpenSpecialTypes/FileManagerBrowserTest.Test/5 timeout. See:

http://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%2BLSan%20Tests%20(2)

http://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%2BLSan%20Tests%20%282%29/builds/55/steps/browser_tests/logs/Test_5

Original issue's description:
> [AudioPlayer] Add test for opening another file from Files.app
> 
> BUG=none
> TEST=manually
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=255003

TBR=hirono@chromium.org,yoshiki@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=none

Review URL: https://codereview.chromium.org/188253002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255205 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255205