Customizable MIME type <-> file extension mapping, step 3.

Delete unused class MimeUtils.

Some MimeUtils calls used to be on the graylist and used by some apps
through reflection; such apps can instead use this public API, for now:
android.webkit.MimeTypeMap.getSingleton().getMimeTypeFromExtension(String)
android.webkit.MimeTypeMap.getSingleton().getExtensionFromMimeType(String)

Test: Treehugger
Change-Id: I409342f1c95d7f2c49b158efa0e43d32081abc76
3 files changed