Remove Android OnScreenKeyboard implementation (#2784)

This implementation was not completed or used in production.

b/330183059
b/111876585

starboard/android/apk/apk_sources.gni

@@ -30,8 +30,6 @@ apk_sources = [
   "//starboard/android/apk/app/src/main/java/dev/cobalt/coat/CobaltTextToSpeechHelper.java",
   "//starboard/android/apk/app/src/main/java/dev/cobalt/coat/CrashContextUpdateHandler.java",
   "//starboard/android/apk/app/src/main/java/dev/cobalt/coat/ErrorDialog.java",
-  "//starboard/android/apk/app/src/main/java/dev/cobalt/coat/KeyboardEditor.java",
-  "//starboard/android/apk/app/src/main/java/dev/cobalt/coat/KeyboardInputConnection.java",
   "//starboard/android/apk/app/src/main/java/dev/cobalt/coat/MediaPlaybackService.java",
   "//starboard/android/apk/app/src/main/java/dev/cobalt/coat/NetworkStatus.java",
   "//starboard/android/apk/app/src/main/java/dev/cobalt/coat/NullCobaltFactory.java",

starboard/android/apk/app/src/main/java/dev/cobalt/coat/CobaltActivity.java

@@ -41,7 +41,7 @@
 import java.util.Arrays;
 import java.util.List;
 import java.util.Locale;
-import java.util.regex.*;
+import java.util.regex.Pattern;
 
 /** Native activity that has the required JNI methods called by the Starboard implementation. */
 public abstract class CobaltActivity extends GameActivity {
@@ -72,7 +72,6 @@ public abstract class CobaltActivity extends GameActivity {
   private CobaltA11yHelper a11yHelper;
 
   private VideoSurfaceView videoSurfaceView;
-  private KeyboardEditor keyboardEditor;
 
   private boolean forceCreateNewVideoSurfaceView = false;
 
@@ -111,12 +110,6 @@ protected void onCreate(Bundle savedInstanceState) {
     a11yHelper = new CobaltA11yHelper(videoSurfaceView);
     addContentView(
         videoSurfaceView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
-
-    if (KeyboardInputConnection.nativeHasOnScreenKeyboard()) {
-      keyboardEditor = new KeyboardEditor(this);
-      addContentView(
-          keyboardEditor, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
-    }
   }
 
   /**
@@ -160,7 +153,7 @@ protected void onStart() {
     DisplayUtil.addDisplayListener(this);
     AudioOutputManager.addAudioDeviceListener(this);
 
-    getStarboardBridge().onActivityStart(this, keyboardEditor);
+    getStarboardBridge().onActivityStart(this);
     super.onStart();
   }