ChromeOS: Use file extensions in Files app to decide which apps to use.

The file browser now decides which apps can open a file based on the
file extensions an app can handle, as well as MIME type.

BUG=167950
TEST=browser_tests LocalFileSystemExtensionApiTest.AppFileHanlder [sic]

Review URL: https://chromiumcodereview.appspot.com/14790018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@198748 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed