Customizable MIME type <-> file extension mapping, step 2.

This CL topic replaces uses of MimeUtils with MimeMap.getDefault():
 - Existing platform calls to MimeUtils are inlined.
 - Other mentions of MimeUtils are changed to refer to MimeMap instead.
 - MimeMap replaces MimeUtils in the CorePlatformApi.
 - MimeMap.{get,compareAndSet}Default are added to the CorePlatformApi.
 - The test_* methods from MimeUtilsTest that check what is now merely
   the default implementation are moved to MimeMapTest and changed to
   JUnit 4 style @Test defaultMap_*.

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)

This CL still leaves MimeUtils in place because some internal uses remain;
a follow-up CL (step 3) will delete MimeUtils.java once those internal
calls have been inlined.

Bug: 120171727
Test: atest CtsLibcoreTestCases:libcore.libcore.net.MimeMapTest
Test: atest CtsLibcoreTestCases
Test: make droid cts
Change-Id: I8a58b9445fac1d22de14b5c56df99170a4bed332

0 files changed, 0 insertions, 0 deletions