Fix a transfer.js test to work in step by step mode

The transferFromDownloadsToTeamDrivemyDriveContent was failing in step
by step mode. This is because it was getting the source files from the
wrong place. Change the test helper transferBetweenVolumes to read from
the correct source.

Bug: 1035220
Change-Id: Iec1ad334ee41b48a1d248dbaeb25d378342b9d85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1972737
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726283}

ui/file_manager/integration_tests/file_manager/transfer.js

@@ -118,10 +118,6 @@ async function transferBetweenVolumes(transferInfo) {
             entry => entry.type !== EntryType.SHARED_DRIVE &&
                 entry.teamDriveName === ''));
   }
-  const myDriveContent =
-      TestEntryInfo.getExpectedRows(transferInfo.source.initialEntries.filter(
-          entry => entry.type !== EntryType.SHARED_DRIVE &&
-              entry.teamDriveName === ''));
 
   let dstContents;
   if (transferInfo.destination.isTeamDrive) {
@@ -142,6 +138,8 @@ async function transferBetweenVolumes(transferInfo) {
       SHARED_DRIVE_ENTRY_SET :
       BASIC_DRIVE_ENTRY_SET;
 
+  const myDriveContent = TestEntryInfo.getExpectedRows(
+      driveFiles.filter(e => e.teamDriveName === '' && e.computerName === ''));
   // Open files app.
   const appId =
       await setupAndWaitUntilReady(RootPath.DOWNLOADS, localFiles, driveFiles);