Do not initialize the volume manager for sign in profiles.

chrome/browser/chromeos/file_manager/volume_manager.cc

Index: chrome/browser/chromeos/file_manager/volume_manager.cc
diff --git a/chrome/browser/chromeos/file_manager/volume_manager.cc b/chrome/browser/chromeos/file_manager/volume_manager.cc
index ef0e3b3bb2bd55a0023b77b76ee1527ed3c4691a..cc489c72d46c6fbde2f3fb779d6f3e28f9bd77c0 100644
--- a/chrome/browser/chromeos/file_manager/volume_manager.cc
+++ b/chrome/browser/chromeos/file_manager/volume_manager.cc
@@ -243,17 +243,19 @@ void VolumeManager::Initialize() {
                                       new_path);
   }
 
+  // If in Sign in profile, then skip mounting and listening for mount events.
+  if (chromeos::ProfileHelper::IsSigninProfile(profile_))
+    return;
+
   // Register 'Downloads' folder for the profile to the file system.
-  if (!chromeos::ProfileHelper::IsSigninProfile(profile_)) {
-    const base::FilePath downloads =
-        file_manager::util::GetDownloadsFolderForProfile(profile_);
-    const bool success = RegisterDownloadsMountPoint(profile_, downloads);
-    DCHECK(success);
-
-    DoMountEvent(chromeos::MOUNT_ERROR_NONE,
-                 CreateDownloadsVolumeInfo(downloads),
-                 kNotRemounting);
-  }
+  const base::FilePath downloads =
+      file_manager::util::GetDownloadsFolderForProfile(profile_);
+  const bool success = RegisterDownloadsMountPoint(profile_, downloads);
+  DCHECK(success);
+
+  DoMountEvent(chromeos::MOUNT_ERROR_NONE,
+               CreateDownloadsVolumeInfo(downloads),
+               kNotRemounting);
 
   // Subscribe to DriveIntegrationService.
   if (drive_integration_service_) {