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Previously, if the MIME type of a file passed to a file handler of a
platform app, the app would be launched without the file, even if the
file handler accepted * or */*. With this change, a file with an unknown
MIME type is treated the same as one with a MIME type of
application/octet-stream.

BUG=219402
TEST=browser_test PlatformAppBrowserTest.LaunchNoType

Review URL: https://chromiumcodereview.appspot.com/14254002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194789 0039d316-1c4b-4281-b951-d872f2087c98