Revert "Tweak RuntimeInit docs around MimeMap registration."

am: 89bcfa5a21

Change-Id: I0ded17aa79749bd189f9149563787d9f56f7bf20

core/java/com/android/internal/os/RuntimeInit.java

@@ -214,10 +214,7 @@ public class RuntimeInit {
         RuntimeHooks.setTimeZoneIdSupplier(() -> SystemProperties.get("persist.sys.timezone"));
 
         /*
-         * Replace libcore's minimal default mapping between MIME types and file
-         * extensions with a mapping that's suitable for Android. Android's mapping
-         * contains many more entries that are derived from IANA registrations but
-         * with several customizations (extensions, overrides).
+         * Set a default mapping between MIME types and file extensions.
          */
         MimeMap.setDefault(MimeMapImpl.createDefaultInstance());