[Files.app] Fix the webview whitelist along with renaming.

The previous commit r231276 renamed some javascript file of Files.app but it've broken the check_licenses test because the whitelist file has not modified. This patch modify it.

BUG=none
TEST=none
TBR=benm@chromium.org

Review URL: https://codereview.chromium.org/47903002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231277 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231277