Use content::RunBlockingPoolTask() in tests.

chrome/browser/media_galleries/media_folder_finder_unittest.cc

Index: chrome/browser/media_galleries/media_folder_finder_unittest.cc
diff --git a/chrome/browser/media_galleries/media_folder_finder_unittest.cc b/chrome/browser/media_galleries/media_folder_finder_unittest.cc
index 8c08d821f97857426e5ec1072953f7ad0826ea8f..b994956bfdbd671f2e2c37b82d1afdd63568782b 100644
--- a/chrome/browser/media_galleries/media_folder_finder_unittest.cc
+++ b/chrome/browser/media_galleries/media_folder_finder_unittest.cc
@@ -11,7 +11,6 @@
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
-#include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/scoped_path_override.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ -19,7 +18,7 @@
 #include "chrome/common/chrome_paths.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/test/test_browser_thread_bundle.h"
-
+#include "content/public/test/test_utils.h"
 
 class MediaFolderFinderTest : public testing::Test {
  public:
@@ -136,14 +135,9 @@ class MediaFolderFinderTest : public testing::Test {
     }
   }
 
-  void RunLoop() {
-    base::RunLoop().RunUntilIdle();
-    content::BrowserThread::GetBlockingPool()->FlushForTesting();
-  }
-
   void RunLoopUntilReceivedCallback() {
     while (!received_results())
-      RunLoop();
+      content::RunAllBlockingPoolTasksUntilIdle();
   }
 
  private:
@@ -210,7 +204,7 @@ TEST_F(MediaFolderFinderTest, ScanAndCancel) {
   CreateMediaFolderFinder(folders, false, expected_results);
   StartScan();
   DeleteMediaFolderFinder();
-  RunLoop();
+  content::RunAllBlockingPoolTasksUntilIdle();
   EXPECT_TRUE(received_results());
 }