Fix UMA recording in ToolbarActionsModel
Fix UMA recording in ToolbarActionsModel

It looks like https://codereview.chromium.org/1241063003 tweaked the UMA for
the former ExtensionToolbarModel accidentally.  Correct this so we get the
proper metrics.

BUG=535380

Review URL: https://codereview.chromium.org/1363193002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#350454}

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