Ensure tests have an active task runner

chrome/browser/ui/webui/ntp/suggestions_combiner_unittest.cc

 // Copyright (c) 2012 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.
 
 // TODO(beaudoin): What is really needed here?
 
 #include <deque>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "chrome/browser/ui/webui/ntp/suggestions_combiner.h"
 #include "chrome/browser/ui/webui/ntp/suggestions_page_handler.h"
 #include "chrome/browser/ui/webui/ntp/suggestions_source.h"
 #include "chrome/test/base/testing_profile.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 struct SourceInfo {
   int weight;
   const char* source_name;
   int number_of_suggestions;
 };
 
@@ skipping 169 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(SuggestionsSourceStub);
 };
 
 class SuggestionsCombinerTest : public testing::Test {
  public:
   SuggestionsCombinerTest() {
   }
 
  protected:
+  content::TestBrowserThreadBundle thread_bundle_;
   Profile* profile_;
   SuggestionsHandler* suggestions_handler_;
   SuggestionsCombiner* combiner_;
 
   void Reset() {
     delete combiner_;
     combiner_ = new SuggestionsCombiner(suggestions_handler_, profile_);
   }
 
  private:
@@ skipping 70 matching lines @@
       } else {
         EXPECT_EQ(description.results[j], static_cast<const char*>(NULL)) <<
             " test index:" << i;
       }
     }
 
     Reset();
   }
 }