Move InMemoryURLIndex Caching Operations to FILE Thread

chrome/browser/autocomplete/history_quick_provider_unittest.cc

Index: chrome/browser/autocomplete/history_quick_provider_unittest.cc
===================================================================
--- chrome/browser/autocomplete/history_quick_provider_unittest.cc	(revision 117518)
+++ chrome/browser/autocomplete/history_quick_provider_unittest.cc	(working copy)
@@ -73,6 +73,8 @@
    "Dogs & Cats & Mice & Other Animals", 1, 1, 0},
 };
 
+// -----------------------------------------------------------------------------
+
 class HistoryQuickProviderTest : public testing::Test,
                                  public ACProviderListener {
  public:
@@ -145,26 +147,21 @@
   history::URLDatabase* db = history_service_->InMemoryDatabase();
   ASSERT_TRUE(db != NULL);
 
-  history::InMemoryURLIndex* index =
-      new history::InMemoryURLIndex(FilePath());
-  PrefService* prefs = profile_->GetPrefs();
-  std::string languages(prefs->GetString(prefs::kAcceptLanguages));
-  index->Init(db, languages);
+  history::InMemoryURLIndex* index = provider_->GetIndex();
   for (size_t i = 0; i < arraysize(quick_test_db); ++i) {
     const TestURLInfo& cur = quick_test_db[i];
     const GURL current_url(cur.url);
     Time visit_time = Time::Now() - TimeDelta::FromDays(cur.days_from_now);
 
     history::URLRow url_info(current_url);
+    url_info.set_id(i + 5000);
     url_info.set_title(UTF8ToUTF16(cur.title));
     url_info.set_visit_count(cur.visit_count);
     url_info.set_typed_count(cur.typed_count);
     url_info.set_last_visit(visit_time);
     url_info.set_hidden(false);
-    index->UpdateURL(i, url_info);
+    index->UpdateURL(url_info);
   }
-
-  provider_->set_index(index);
 }
 
 HistoryQuickProviderTest::SetShouldContain::SetShouldContain(