Not update jumplist icons when deletion of JumplistIcon folder fails

According to UMA, the deletion of JumplistIcons folder fails for a small
portion of Chrome users. In this case, we should skip updating the jumplist
icons which will bloat the folder. In addition, there is no need to run
base::CreateDirectory() trying to create the same folder.

BUG=40407,179576

Review-Url: https://codereview.chromium.org/2717813002
Cr-Commit-Position: refs/heads/master@{#454674}
1 file changed