Fixing broken CupsProxyService dep

Adding necessary dependency on IppParser, fixes some breaking fuzzer
builds.

Bug: chromium:1001869
Test: build succeeds
Change-Id: Ie04e8fc0de87b9639bf4086d31131b91ccae2b35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1793253Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694954}

chrome/services/cups_proxy/BUILD.gn

@@ -30,6 +30,7 @@ source_set("cups_proxy") {
     "//base",
     "//chrome/services/cups_proxy/public/cpp",
     "//chrome/services/cups_proxy/public/mojom",
+    "//chrome/services/ipp_parser",
     "//chromeos/dbus",
     "//net",
   ]