Settings reset prompt: Fix crash when fetching default settings.

When the Chrome installation has a brand code, the SettingsResetPromptModel may try to fetch default settings over the network. If the fetch fails, the ProfileResetter is passed a null pointer and any attempt to reset a setting will crash.

BUG=716372

Review-Url: https://codereview.chromium.org/2852883002
Cr-Commit-Position: refs/heads/master@{#468270}
1 file changed