Remove unused code

And TODO(because it already supports)

Bug: n/a
Change-Id: I85a895531a3cec4c94c8538b174d24fbefd6c9c4
Test: n/a
diff --git a/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java b/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
index d27aa99..eab737b 100644
--- a/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
+++ b/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
@@ -299,11 +299,6 @@
                                             findViewById(R.id.webview_container)
                                                     .setVisibility(View.VISIBLE);
                                             mBootCompleted.open();
-                                            // TODO(b/376813452): support talkback as well
-                                            int keyVisibility =
-                                                    mAccessibilityManager.isEnabled()
-                                                            ? View.GONE
-                                                            : View.VISIBLE;
                                             updateModifierKeysVisibility();
                                         }
                                     }