views: Implement NativeTableGtk::SetColumnWidth method.
views: Implement NativeTableGtk::SetColumnWidth method.

BUG=None
TEST=export GYP_DEFINES="toolkit_views" && gclient runhooks && make -j4 -k views_examples
     out/Debug/views_examples, everything should work as before.

Review URL: http://codereview.chromium.org/6166011

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@71262 0039d316-1c4b-4281-b951-d872f2087c98

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