Fix TopSitesObserver implementation
Add a virtual destructor since all class with a virtual method should have a virtual destructor. Disable copy constructor and assignment operator using the macro DISALLOW_COPY_AND_ASSIGN since you don't want to do slicing when using a class with virtual methods. BUG=None Review URL: https://codereview.chromium.org/853643003 Cr-Commit-Position: refs/heads/master@{#311473}
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