Make ContextMenuParamsBuilder use the new link text data.
Make ContextMenuParamsBuilder use the new link text data.

a) Remove the code that was trying to do things that
should be done on the other side of the WebKit API.

b) Start using the newly-plumbed WebContextMenuData
member instead.

R=jochen,jam
BUG=506727

Review URL: https://codereview.chromium.org/1209213010

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#337857}

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