Where does Google Chrome save temporary pdf files?

Note: This no longer works since the Chrome disk cache format has changed

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It's in that directory, all right. Just uses a random string for filenames. Test it out:

find ~/.cache/google-chrome -type f -exec file {} + | grep PDF

For example:

$ find .cache/google-chrome/ -type f -exec file {} + | grep PDF
.cache/google-chrome/Default/Cache/f_004bf0:       PDF document, version 1.5
.cache/google-chrome/Default/Cache/f_004c01:       PDF document, version 1.4