Rename the confusingly named "ContentNode" class to "TagNode". Also considered "AnnotationNode", "LabelNode", "BadgeNode", but "TagNode" seemed simplest.
Rename the confusingly named "ContentNode" class to "TagNode".
Also considered "AnnotationNode", "LabelNode", "BadgeNode", but "TagNode" seemed simplest.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1169853008

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