UnifiedEmail: Fix proguard rule.

ConversationSpecialItemView is an interface.

The issue as harmless, but triggered this message during build:

Warning: The rule `-keepclasseswithmembers  class *extends com.android.mail.ui.ConversationSpecialItemView {
  *** setAnimatedHeight(...);
}` uses extends but actually matches implements.

Test: Treehugger
Change-Id: I5811cd2a8d930ff803ae986f3a3422f34ea7c1ad
1 file changed