Cleanup: Remove unused variables in chrome/ found by Scythe.

chrome/browser/history/history_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.
 
 // History unit tests come in two flavors:
 //
 // 1. The more complicated style is that the unit test creates a full history
 //    service. This spawns a background thread for the history backend, and
 //    all communication is asynchronous. This is useful for testing more
 //    complicated things or end-to-end behavior.
@@ skipping 960 matching lines @@
 
     EXPECT_TRUE(found)
         << "Error \"" << cur_reason.name << "\" not found in historical list."
         << std::endl
         << "Please add it.";
   }
 }
 
 class HistoryTest : public testing::Test {
  public:
-  HistoryTest()
-      : got_thumbnail_callback_(false),
-        query_url_success_(false) {
+  HistoryTest() : query_url_success_(false) {
   }
 
   ~HistoryTest() override {}
 
   void OnMostVisitedURLsAvailable(const MostVisitedURLList* url_list) {
     most_visited_urls_ = *url_list;
     base::MessageLoop::current()->Quit();
   }
 
  protected:
@@ skipping 94 matching lines @@
   MostVisitedURLList most_visited_urls_;
 
   // When non-NULL, this will be deleted on tear down and we will block until
   // the backend thread has completed. This allows tests for the history
   // service to use this feature, but other tests to ignore this.
   scoped_ptr<history::HistoryService> history_service_;
 
   // names of the database files
   base::FilePath history_dir_;
 
-  // Set by the thumbnail callback when we get data, you should be sure to
-  // clear this before issuing a thumbnail request.
-  bool got_thumbnail_callback_;
-  std::vector<unsigned char> thumbnail_data_;
-
   // Set by the redirect callback when we get data. You should be sure to
   // clear this before issuing a redirect request.
   history::RedirectList saved_redirects_;
 
   // For history requests.
   base::CancelableTaskTracker tracker_;
 
   // For saving URL info after a call to QueryURL
   bool query_url_success_;
   URLRow query_url_row_;
@@ skipping 752 matching lines @@
   std::vector<PageUsageData*> results;
   db_->QuerySegmentUsage(segment_time, 10, &results);
   ASSERT_EQ(1u, results.size());
   EXPECT_EQ(url, results[0]->GetURL());
   EXPECT_EQ(segment_id, results[0]->GetID());
   EXPECT_EQ(title, results[0]->GetTitle());
   STLDeleteElements(&results);
 }
 
 }  // namespace history