Only invoke WebKit methods in browsing data helpers on the WEBKIT thread.

chrome/browser/browsing_data_helper_browsertest.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Contains code shared by all browsing data browsertests.
+
+#ifndef CHROME_BROWSER_BROWSING_DATA_HELPER_BROWSERTEST_H_
+#define CHROME_BROWSER_BROWSING_DATA_HELPER_BROWSERTEST_H_
+#pragma once
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/message_loop.h"
+
+// This template can be used for the StartFetching methods of the browsing data
+// helper classes. It is supposed to be instantiated with the respective browsing
+// data info type.
+template <typename T>
+class BrowsingDataHelperCallback {
+ public:
+  BrowsingDataHelperCallback() {}
+
+  const std::vector<T>& result()
+  {
+    MessageLoop::current()->Run();

[Bernhard Bauer, 2011/02/10 12:52:19]

Maybe you could DCHECK that |result_| was actually set (and nothing quit the
MessageLoop before that)?

+    return result_;
+  }
+
+  void callback(const std::vector<T>& info) {
+    result_ = info;
+    MessageLoop::current()->Quit();
+  }
+
+ private:
+  std::vector<T> result_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowsingDataHelperCallback);
+};
+
+#endif  // CHROME_BROWSER_BROWSING_DATA_HELPER_BROWSERTEST_H_