By Laura Noonan LONDON (Reuters) - The interim chief executive recently appointed to revamp mobile phone maker BlackBerry is in it "for the long haul", the company's largest shareholder Prem Watsa told Reuters. Watsa earlier this year sought partners in a $4.7 billion bid to take BlackBerry private. But his company, Fairfax Financial, then opted for a lead role in a $1 billion note offering to provide the Canadian company with money to fund a turnaround. John Chen, a turnaround specialist with Sybase in the late 1990s, was brought in as interim CEO.



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