Revert of [Android] Stop hiding the RWHV layer subtree when hiding the widget

ui/android/java/src/org/chromium/ui/base/WindowAndroid.java

Index: ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
diff --git a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
index 0bf7bd1ade48d9faf55f2c80dffaa5e696475318..087022180a040d72c42908dad0ff3afd439866f5 100644
--- a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
+++ b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
@@ -236,24 +236,6 @@
     }
 
     /**
-     * For window instances associated with an activity, notifies any listeners
-     * that the activity has been paused.
-     */
-    protected void onActivityPaused() {
-        if (mNativeWindowAndroid == 0) return;
-        nativeOnActivityPaused(mNativeWindowAndroid);
-    }
-
-    /**
-     * For window instances associated with an activity, notifies any listeners
-     * that the activity has been paused.
-     */
-    protected void onActivityResumed() {
-        if (mNativeWindowAndroid == 0) return;
-        nativeOnActivityResumed(mNativeWindowAndroid);
-    }
-
-    /**
      * Responds to the intent result if the intent was created by the native window.
      * @param requestCode Request code of the requested intent.
      * @param resultCode Result code of the requested intent.
@@ -369,8 +351,6 @@
     private native void nativeOnVSync(long nativeWindowAndroid,
                                       long vsyncTimeMicros,
                                       long vsyncPeriodMicros);
-    private native void nativeOnActivityPaused(long nativeWindowAndroid);
-    private native void nativeOnActivityResumed(long nativeWindowAndroid);
     private native void nativeDestroy(long nativeWindowAndroid);
 
 }