Fix a data race in multiple unit tests processes.

chrome/browser/sync_file_system/logger_unittest.cc

 // Copyright 2013 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 "base/macros.h"
 #include "chrome/browser/sync_file_system/logger.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using drive::EventLogger;
 
@@ skipping 13 matching lines @@
   return event.what.find(contains_string) != std::string::npos;
 }
 
 }  // namespace
 
 class LoggerTest : public testing::Test {
  public:
   LoggerTest() {}
 
   void SetUp() override {
-    logging::SetMinLogLevel(logging::LOG_INFO);
     util::ClearLog();
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LoggerTest);
 };
 
 TEST_F(LoggerTest, GetLogHistory) {
   LogSampleEvents();
 
   const std::vector<EventLogger::Event> log = util::GetLogHistory();
   ASSERT_EQ(3u, log.size());
   EXPECT_TRUE(ContainsString("Info test message", log[0]));
   EXPECT_TRUE(ContainsString("Warning test message", log[1]));
   EXPECT_TRUE(ContainsString("Error test message", log[2]));
 }
 
 TEST_F(LoggerTest, ClearLog) {
   LogSampleEvents();
   EXPECT_EQ(3u, util::GetLogHistory().size());
 
   util::ClearLog();
   EXPECT_EQ(0u, util::GetLogHistory().size());
 }
 
 
 }  // namespace sync_file_system