Change ARC notification type from SIMPLE to BASE_FORMAT
Change ARC notification type from SIMPLE to BASE_FORMAT

Notification type SIMPLE is for the web notification actually and it triggers some hacks which causes the problem (see the issue).

This patch changes the type to BASE_FORMAT without hacks.

BUG=b/26831435

Review URL: https://codereview.chromium.org/1640333003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#372039}

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