The mime type list can be NULL to allow all files. Handle this case when converting to a std::string for serialization (the backend treats empty string the same as NULL). Review URL: http://codereview.chromium.org/6824045
The mime type list can be NULL to allow all files. Handle this case when
converting to a std::string for serialization (the backend treats empty string
the same as NULL).
Review URL: http://codereview.chromium.org/6824045

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@81134 0039d316-1c4b-4281-b951-d872f2087c98

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