Revert "Re-land: Enable XFA-Forms for the PDFium plugin."
Revert "Re-land: Enable XFA-Forms for the PDFium plugin."

This reverts commit ed07b3773e3aad4a44a79a48c17162ef57ca82ee.
Reason for revert: crbug.com/596373.

BUG=596373
TBR=thakis@chromium.org

Review URL: https://codereview.chromium.org/1821763002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#382356}

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