fix(android): Fix for webView window not being destroyed correctly causing memory leak (bug apache#290)

Author: jeansparipassu

src/android/InAppBrowser.java

@@ -534,6 +534,16 @@ public void onPageFinished(WebView view, String url) {
                             dialog.dismiss();
                             dialog = null;
                         }
+
+                        // Fix for webView window not being destroyed correctly causing memory leak
+                        // (https://github.com/apache/cordova-plugin-inappbrowser/issues/290)
+                        if (url.equals(new String("about:blank"))) {
+                            inAppWebView.onPause();
+                            inAppWebView.removeAllViews();
+                            inAppWebView.destroyDrawingCache();
+                            inAppWebView.destroy();
+                            inAppWebView = null;
+                        }
                     }
                 });
                 // NB: From SDK 19: "If you call methods on WebView from any thread