Merge to XFA: Change DEPS hooks paths to include 'pdfium/'.

This will break existing checkouts based on the instructions provided.

Instead of having a single pdfium directory, checkouts will now compromise of:
("repo" can be named anything)

repo/.gclient
repo/pdfium/.git
repo/pdfium/others...

To convert an existing checkout, do something like:

mkdir repo
mv pdfium repo
rm repo/pdfium/.gclient_entries # will be regenerated, with a warning
mv repo/pdfium/.gclient repo
edit repo/.gclient and change "name: '.'" to "name: 'pdfium'"

Instructions for getting a new checkout are in README.md in this CL.

R=thestig@chromium.org, tsepez@chromium.org

Review URL: https://codereview.chromium.org/1406383003 .

Review URL: https://codereview.chromium.org/1422633002 .

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