Removed HostControl implementation of IPersistStreamInitImpl.
Removed HostControl implementation of IPersistStreamInitImpl.

See http://msdn.microsoft.com/en-us/visualc/ee309358.aspx. According to the description of the vulnerability, O3D is not vulnerable. But HostControl does not need to implement this interface anyway so I'm removing it.
Review URL: http://codereview.chromium.org/160342

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@21994 0039d316-1c4b-4281-b951-d872f2087c98

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