[Extensions Toolbar] Fix Drag-and-Drop boolean setting
[Extensions Toolbar] Fix Drag-and-Drop boolean setting

The |is_drag_in_progress_| boolean on ToolbarActionsBar was being reset in two
places. Fix it.

Review URL: https://codereview.chromium.org/1371323002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#351320}

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