Remove support for legacy WebNodeCollection
Remove support for legacy WebNodeCollection

Remove support for legacy WebNodeCollection now that all the callers on
Chromium side have been updated to use WebElementCollection instead.

R=tkent, dglazkov@chromium.org

Review URL: https://codereview.chromium.org/145353019

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@166939 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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