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This is needed for propagating the extension's permissions to the extension's iframe, in the rare event that the PDF is loaded in a sub frame, and the extension does not have access to the top frame. For instance, when a http:-PDF file is embedded in a local file, while "Allow access to local URLs" is disabled. Note: Propagating permissions by inserting content scripts is an undocumented feature (http://crbug.com/302548). Whenever it breaks, the issue (cross-domain permissions for XHR) can be solved by using a content script that gets the blob using the XMLHttpRequest API, followed by `postMessage` (via transferables) to efficiently pass the arraybuffer back to the PDF Viewer.
