DriveTestVolume: Remove extra CheckForUpdates calls

DriveTestVolume::CreateEntry calls CreateFile|Directory and then calls
CheckForUpdates. CreateFile|Directory also call CheckForUpdates: seems
redundant given that the caller does it for them.

Bug: 836254
Change-Id: Ia778a64d0195925a827c40dc6dfdf3877a6611d3
Reviewed-on: https://chromium-review.googlesource.com/1110077
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Stuart Langley <slangley@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569958}

chrome/browser/chromeos/file_manager/file_manager_browsertest_base.cc

@@ -580,8 +580,6 @@ class DriveTestVolume : public TestVolume {
     base::RunLoop().RunUntilIdle();
     ASSERT_TRUE(error == google_apis::HTTP_SUCCESS);
     ASSERT_TRUE(entry);
-
-    CheckForUpdates();
   }
 
   // Creates a test file with the given spec.
@@ -623,8 +621,6 @@ class DriveTestVolume : public TestVolume {
     base::RunLoop().RunUntilIdle();
     ASSERT_TRUE(error == google_apis::HTTP_SUCCESS);
     ASSERT_TRUE(entry);
-
-    CheckForUpdates();
   }
 
   // Notifies FileSystem that the contents in FakeDriveService have changed,