Use multiTargetTapNotificationEnabled instead of primaryHoverType in test.
Use multiTargetTapNotificationEnabled instead of primaryHoverType in test.

RenderViewImplBlinkSettingsTest tries to verify correct parsing, and doesn't
really care about which settings to check. As I'm about to remove primaryHoverType
getter, switch to another setting.

BUG=530183

Review URL: https://codereview.chromium.org/1352583002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#349445}

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