Add task runners to more tests

chrome/browser/autocomplete/in_memory_url_index_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.
 
 #include <algorithm>
 #include <fstream>
 
 #include "base/auto_reset.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 1187 matching lines @@
   InMemoryURLIndexCacheTest() {}
 
  protected:
   void SetUp() override;
   void TearDown() override;
 
   // Pass-through functions to simplify our friendship with InMemoryURLIndex.
   void set_history_dir(const base::FilePath& dir_path);
   bool GetCacheFilePath(base::FilePath* file_path) const;
 
+  content::TestBrowserThreadBundle thread_bundle_;
   base::ScopedTempDir temp_dir_;
   scoped_ptr<InMemoryURLIndex> url_index_;
 };
 
 void InMemoryURLIndexCacheTest::SetUp() {
   ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
   base::FilePath path(temp_dir_.path());
   url_index_.reset(
       new InMemoryURLIndex(nullptr, nullptr, path, kTestLanguages));
 }
@@ skipping 23 matching lines @@
   ASSERT_TRUE(GetCacheFilePath(&full_file_path));
   std::vector<base::FilePath::StringType> actual_parts;
   full_file_path.GetComponents(&actual_parts);
   ASSERT_EQ(expected_parts.size(), actual_parts.size());
   size_t count = expected_parts.size();
   for (size_t i = 0; i < count; ++i)
     EXPECT_EQ(expected_parts[i], actual_parts[i]);
   // Must clear the history_dir_ to satisfy the dtor's DCHECK.
   set_history_dir(base::FilePath());
 }