Issue 6418 - Override `onShowFileChooser` method

libadblockplus-android-webview/src/org/adblockplus/libadblockplus/android/webview/AdblockWebView.java

Index: libadblockplus-android-webview/src/org/adblockplus/libadblockplus/android/webview/AdblockWebView.java
diff --git a/libadblockplus-android-webview/src/org/adblockplus/libadblockplus/android/webview/AdblockWebView.java b/libadblockplus-android-webview/src/org/adblockplus/libadblockplus/android/webview/AdblockWebView.java
index 98b67a57e8b88d9e139ebc61160b58d2f193ab4b..afddda79172c8f3778c2155412c9b157552fb10d 100644
--- a/libadblockplus-android-webview/src/org/adblockplus/libadblockplus/android/webview/AdblockWebView.java
+++ b/libadblockplus-android-webview/src/org/adblockplus/libadblockplus/android/webview/AdblockWebView.java
@@ -22,6 +22,7 @@ import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
+import android.net.Uri;
 import android.net.http.SslError;
 import android.os.Build;
 import android.os.Handler;
@@ -575,6 +576,20 @@ public class AdblockWebView extends WebView
         extWebChromeClient.onProgressChanged(view, newProgress);
       }
     }
+
+    @Override
+    public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback,
+                                     FileChooserParams fileChooserParams)
+    {
+      if (extWebChromeClient != null)
+      {
+        return extWebChromeClient.onShowFileChooser(webView, filePathCallback, fileChooserParams);
+      }
+      else
+      {
+        return super.onShowFileChooser(webView, filePathCallback, fileChooserParams);
+      }
+    }
   };
 
   public int getAllowDrawDelay()