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AXNodeData::state is a bitmask used for setting accessible state flags such as
ui::AX_STATE_DISABLED. It is initialised to 0xFFFFFF, which turns all flags on.
This is done in order to more easily catch bugs where no flags are set at all -
it must be cleared to 0x0 before use. Add a comment explaining this.

BUG=668569

Review-Url: https://codereview.chromium.org/2528103002
Cr-Commit-Position: refs/heads/master@{#435020}