Stop recording metrics for SMB url parsing failures.

These failures are normal and expected as a result of user error.
Further, recording these parse failures pollutes the metric, which is
intended to record D-Bus mount call failures.

BUG=907207

Change-Id: I78bdf90b49a0954e87ff233679bcc24a6a298799
Reviewed-on: https://chromium-review.googlesource.com/c/1491059Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Anand Mistry <amistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636219}

chrome/browser/chromeos/smb_client/smb_service.cc

@@ -256,8 +256,7 @@ void SmbService::CallMount(const file_system_provider::MountOptions& options,
 
   SmbUrl parsed_url(share_path.value());
   if (!parsed_url.IsValid()) {
-    FireMountCallback(
-        std::move(callback),
+    std::move(callback).Run(
         TranslateErrorToMountResult(base::File::Error::FILE_ERROR_INVALID_URL));
     return;
   }