Add asserts to TestingProfile::CreateHistoryService to ensure files are deleted

chrome/browser/safe_browsing/browser_feature_extractor_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/safe_browsing/browser_feature_extractor.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 33 matching lines @@
   virtual ~MockClientSideDetectionService() {};
 
   MOCK_CONST_METHOD1(IsBadIpAddress, bool(const std::string&));
 };
 }  // namespace
 
 class BrowserFeatureExtractorTest : public ChromeRenderViewHostTestHarness {
  protected:
   virtual void SetUp() {
     ChromeRenderViewHostTestHarness::SetUp();
-    profile()->CreateHistoryService(true /* delete_file */, false /* no_db */);
+    ASSERT_TRUE(profile()->CreateHistoryService(
+        true /* delete_file */, false /* no_db */));
     service_.reset(new StrictMock<MockClientSideDetectionService>());
     extractor_.reset(
         new BrowserFeatureExtractor(web_contents(), service_.get()));
     num_pending_ = 0;
     browse_info_.reset(new BrowseInfo);
   }
 
   virtual void TearDown() {
     extractor_.reset();
     profile()->DestroyHistoryService();
@@ skipping 504 matching lines @@
   EXPECT_TRUE(hosts.find("evil.com") != hosts.end());
   feature_name = base::StringPrintf("%s%s", features::kBadIpFetch,
                                     "92.92.92.92");
   EXPECT_TRUE(features.count(feature_name));
   hosts = features[feature_name];
   EXPECT_EQ(2U, hosts.size());
   EXPECT_TRUE(hosts.find("bad.com") != hosts.end());
   EXPECT_TRUE(hosts.find("evil.com") != hosts.end());
 }
 }  // namespace safe_browsing