Remove WebView from view system before destroying per documentation f…

…or WebView:

http://developer.android.com/reference/android/webkit/WebView.html#destroy()
"This method should be called after the WebView has been removed from the view
system."

In rare circumstances, destroying without removing from the view system could
crash the app.

src/com/andrewshu/android/reddit/BrowserActivity.java

@@ -9,6 +9,7 @@
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
+import android.view.View;
 import android.view.Window;
 import android.webkit.CookieSyncManager;
 import android.webkit.WebChromeClient;
@@ -126,6 +127,8 @@ public void onPause() {
 	@Override
 	public void onDestroy() {
 		super.onDestroy();
+		// Must remove the WebView from the view system before destroying.
+		webview.setVisibility(View.GONE);
 		webview.destroy();
 		webview = null;
 	}