refactor: move printing out of chromium_src (#15023)

* remove printing related things from chromium_src

* chore: add printing build flag and patch

* fix: include PrintingService on other platforms too

* fix: printing_handler is only needed on Windows

* fix: format BUILD.gn properly

* fix: rename printing build flag to avoid conflict with chromium

* fix: place previously missed printing calls behind build flag

* fix: accidentally renamed flag in patch file

* fix: don't include all printing strings

* fix: allow ShowItemInFolder and OpenItem to block, fixing a DCHECK crash

* fix: make things compile, some changes got lost while rebasing

* fix: remove rogue line from BUILD.gn

* chore: update patch description

* style: lint fix

* chore: use chromium printing buildflag, move node related stuff out of patch

* revert: remove ScopedAllowBlockingForTesting call

* fix: fix my rebase blooper

* fix: re-add header lost during rebase, update patch

* fix: add <map> include, tweak the patch a bit

* revert: remove rogue diff from patch

* fix: clean up after rebase

lib/browser/api/web-contents.js

@@ -249,6 +249,8 @@ WebContents.prototype.printToPDF = function (options, callback) {
     printingSetting.mediaSize = PDFPageSizes['A4']
   }
 
+  // Chromium expects this in a 0-100 range number, not as float
+  printingSetting.scaleFactor *= 100
   this._printToPDF(printingSetting, callback)
 }