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Eliminate ObjectTraits<T> classes in favor of putting these methods directly on
the generated *_Data classes. ObjectTraits<T> was added to hide these methods
from public classes, but now that *_Data classes are internal, there is no
longer any need for ObjectTraits<T>.

Review URL: https://codereview.chromium.org/131033002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244071 0039d316-1c4b-4281-b951-d872f2087c98