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Fix type in printing.gyp: printing/backend/cups_deleter{,s}.{h,cc}

Disable the cloud print connector like in GN in chrome.gyp

Originally attempted as https://crrev.com/2170123003

BUG=630791
TEST=Ran `GYP_CHROMIUM_NO_ACTION=0 gclient sync` and verified that chrome compiles

Review-Url: https://codereview.chromium.org/2179633002
Cr-Commit-Position: refs/heads/master@{#407354}