Rename LatinKeyboardView to MainKeyboardView

Change-Id: I8f3123b8d727c7beb72e226f80c17794f89c8b60
diff --git a/java/res/layout/input_view.xml b/java/res/layout/input_view.xml
index 3863534..99f8e27 100644
--- a/java/res/layout/input_view.xml
+++ b/java/res/layout/input_view.xml
@@ -56,7 +56,7 @@
             style="?attr/suggestionsStripBackgroundStyle" />
     </LinearLayout>
 
-    <com.android.inputmethod.keyboard.LatinKeyboardView
+    <com.android.inputmethod.keyboard.MainKeyboardView
         android:id="@+id/keyboard_view"
         android:layout_alignParentBottom="true"
         android:layout_width="match_parent"