Revert "UI refresh for voice call screen."

This reverts commit b6c615dba7609e5134e960a92e723cfeadfbc589.

Change-Id: Ibfe295c51323b4e0352098470921ffae114f5c83
diff --git a/java/com/android/incallui/CallButtonPresenter.java b/java/com/android/incallui/CallButtonPresenter.java
index be80343..7d12d52 100644
--- a/java/com/android/incallui/CallButtonPresenter.java
+++ b/java/com/android/incallui/CallButtonPresenter.java
@@ -427,6 +427,11 @@
       return;
     }
 
+    if (call != null) {
+      inCallButtonUi.updateInCallButtonUiColors(
+          InCallPresenter.getInstance().getThemeColorManager().getSecondaryColor());
+    }
+
     final boolean isEnabled =
         state.isConnectingOrConnected() && !state.isIncoming() && call != null;
     inCallButtonUi.setEnabled(isEnabled);