2 fixes

Fix crash when pausing/resuming application after closing InAppBrowser
Whenever closing an InAppBrowser instance, a webview was left in memory with about:blank page.
This change fixes the issue by destroying and freeing the inAppWebView object.

Author: monove

src/android/InAppBrowser.java

@@ -352,7 +352,7 @@ public void onReset() {
      */
     @Override
     public void onPause(boolean multitasking) {
-        if (shouldPauseInAppBrowser) {
+        if (shouldPauseInAppBrowser && inAppWebView != null) {
             inAppWebView.onPause();
         }
     }
@@ -362,7 +362,7 @@ public void onPause(boolean multitasking) {
      */
     @Override
     public void onResume(boolean multitasking) {
-        if (shouldPauseInAppBrowser) {
+        if (shouldPauseInAppBrowser && inAppWebView != null) {
             inAppWebView.onResume();
         }
     }
@@ -534,6 +534,13 @@ public void onPageFinished(WebView view, String url) {
                             dialog.dismiss();
                             dialog = null;
                         }
+                        if (url.equals("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