drive: Change EventLogger to take printf format

chrome/browser/chromeos/drive/event_logger_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/chromeos/drive/event_logger.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace drive {
 
-TEST(DriveEventLoggerTest, BasicLogging) {
+TEST(EventLoggerTest, BasicLogging) {
   EventLogger logger(3);  // At most 3 events are kept.
   EXPECT_EQ(0U, logger.history().size());
 
   logger.Log("first");
-  logger.Log("second");
+  logger.Log("%dnd", 2);
   logger.Log("third");
 
   // Events are recorded in the chronological order with sequential IDs.
   ASSERT_EQ(3U, logger.history().size());
   EXPECT_EQ(0, logger.history()[0].id);
-  EXPECT_EQ(std::string("first"), logger.history()[0].what);
+  EXPECT_EQ("first", logger.history()[0].what);
   EXPECT_EQ(1, logger.history()[1].id);
-  EXPECT_EQ(std::string("second"), logger.history()[1].what);
+  EXPECT_EQ("2nd", logger.history()[1].what);
   EXPECT_EQ(2, logger.history()[2].id);
-  EXPECT_EQ(std::string("third"), logger.history()[2].what);
+  EXPECT_EQ("third", logger.history()[2].what);
 
   logger.Log("fourth");
   // It does not log events beyond the specified.
   ASSERT_EQ(3U, logger.history().size());
   // The oldest events is pushed out.
   EXPECT_EQ(1, logger.history()[0].id);
-  EXPECT_EQ(std::string("second"), logger.history()[0].what);
+  EXPECT_EQ("2nd", logger.history()[0].what);
   EXPECT_EQ(2, logger.history()[1].id);
-  EXPECT_EQ(std::string("third"), logger.history()[1].what);
+  EXPECT_EQ("third", logger.history()[1].what);
   EXPECT_EQ(3, logger.history()[2].id);
-  EXPECT_EQ(std::string("fourth"), logger.history()[2].what);
+  EXPECT_EQ("fourth", logger.history()[2].what);
 }
 
 }   // namespace drive