Fix flaky FileFlusherTest.DuplicateRequests

chrome/browser/chromeos/base/file_flusher_unittest.cc

Index: chrome/browser/chromeos/base/file_flusher_unittest.cc
diff --git a/chrome/browser/chromeos/base/file_flusher_unittest.cc b/chrome/browser/chromeos/base/file_flusher_unittest.cc
index cfcff2a0787d8199d3806b5a985901bd75eff01e..4357be1e04d8ff884ffa5ed8a55122769ab09786 100644
--- a/chrome/browser/chromeos/base/file_flusher_unittest.cc
+++ b/chrome/browser/chromeos/base/file_flusher_unittest.cc
@@ -136,10 +136,12 @@ TEST_F(FileFlusherTest, Exclude) {
 TEST_F(FileFlusherTest, DuplicateRequests) {
   std::unique_ptr<FileFlusher> flusher(CreateFileFlusher());
   base::RunLoop run_loop;
+  flusher->PauseForTest();
   flusher->RequestFlush(GetTestFilePath("dir1"), std::vector<base::FilePath>(),
                         base::Closure());
   flusher->RequestFlush(GetTestFilePath("dir1"), std::vector<base::FilePath>(),
                         run_loop.QuitClosure());
+  flusher->ResumeForTest();
   run_loop.Run();
 
   EXPECT_EQ(1, GetFlushCount("dir1/file1"));