Data from the autocomplete predictor wasn't deleted immediately when deleting browsing history.

chrome/browser/predictors/autocomplete_action_predictor_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 "chrome/browser/predictors/autocomplete_action_predictor.h"
 
 #include <stddef.h>
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
@@ skipping 73 matching lines @@
 
 namespace predictors {
 
 class AutocompleteActionPredictorTest : public testing::Test {
  public:
   AutocompleteActionPredictorTest()
       : ui_thread_(BrowserThread::UI, &loop_),
         db_thread_(BrowserThread::DB, &loop_),
         file_thread_(BrowserThread::FILE, &loop_),
         profile_(new TestingProfile()),
-        predictor_(new AutocompleteActionPredictor(profile_.get())) {
+        predictor_(nullptr) {
   }
 
   ~AutocompleteActionPredictorTest() override {
     predictor_.reset(NULL);
     profile_.reset(NULL);
     base::RunLoop().RunUntilIdle();
   }
 
   void SetUp() override {
     base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
         switches::kPrerenderFromOmnibox,
         switches::kPrerenderFromOmniboxSwitchValueEnabled);
 
+    ASSERT_TRUE(profile_->CreateHistoryService(true, false));
+    predictor_.reset(new AutocompleteActionPredictor(profile_.get()));
     predictor_->CreateLocalCachesFromDatabase();
-    ASSERT_TRUE(profile_->CreateHistoryService(true, false));
     profile_->BlockUntilHistoryProcessesPendingRequests();
 
     ASSERT_TRUE(predictor_->initialized_);
     ASSERT_TRUE(db_cache()->empty());
     ASSERT_TRUE(db_id_cache()->empty());
   }
 
   void TearDown() override {
+    predictor_->Shutdown();
     profile_->DestroyHistoryService();
-    predictor_->Shutdown();
   }
 
  protected:
   typedef AutocompleteActionPredictor::DBCacheKey DBCacheKey;
   typedef AutocompleteActionPredictor::DBCacheValue DBCacheValue;
   typedef AutocompleteActionPredictor::DBCacheMap DBCacheMap;
   typedef AutocompleteActionPredictor::DBIdCacheMap DBIdCacheMap;
 
   void AddAllRowsToHistory() {
     for (size_t i = 0; i < arraysize(test_url_db); ++i)
@@ skipping 250 matching lines @@
          AutocompleteActionPredictor::ACTION_PRERENDER) ?
         AutocompleteActionPredictor::ACTION_PRECONNECT :
         test_url_db[i].expected_action;
     EXPECT_EQ(expected_action,
               predictor()->RecommendAction(test_url_db[i].user_text, match))
         << "Unexpected action for " << match.destination_url;
   }
 }
 
 }  // namespace predictors