Use ContentViewCore's container view to keep screen on

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

Index: ui/android/java/src/org/chromium/ui/WindowAndroid.java
diff --git a/ui/android/java/src/org/chromium/ui/WindowAndroid.java b/ui/android/java/src/org/chromium/ui/WindowAndroid.java
index 477e5e6f29f1e8e3eed1c6a62963b8add728c1ec..6bbe854e33da3eaae5cdc7cfd6803858720b335b 100644
--- a/ui/android/java/src/org/chromium/ui/WindowAndroid.java
+++ b/ui/android/java/src/org/chromium/ui/WindowAndroid.java
@@ -11,7 +11,6 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.util.SparseArray;
-import android.view.WindowManager;
 import android.widget.Toast;
 
 import java.util.HashMap;
@@ -200,14 +199,6 @@ public class WindowAndroid {
         return mNativeWindowAndroid;
     }
 
-    public void keepScreenOn(boolean screenOn) {
-        if (screenOn) {
-            mActivity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
-        } else {
-            mActivity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
-        }
-    }
-
     private native int nativeInit();
     private native void nativeDestroy(int nativeWindowAndroid);