Rename LatinKeyboardView to MainKeyboardView

Change-Id: I8f3123b8d727c7beb72e226f80c17794f89c8b60
diff --git a/java/proguard.flags b/java/proguard.flags
index b66c9a9..24b4c19 100644
--- a/java/proguard.flags
+++ b/java/proguard.flags
@@ -32,7 +32,7 @@
   *;
 }
 
--keep class com.android.inputmethod.keyboard.LatinKeyboardView {
+-keep class com.android.inputmethod.keyboard.MainKeyboardView {
   # Keep getter/setter methods for ObjectAnimator
   int getLanguageOnSpacebarAnimAlpha();
   void setLanguageOnSpacebarAnimAlpha(int);