Move AutofillElements.{h,cpp} from editing/ios to editing/cocoa since they're used on macOS
Created attachment 373765 [details] Patch
http://trac.webkit.org/r247279
<rdar://problem/52853105>
This broke the build: /Volumes/Data/slave/mojave-release/build/Source/WebKitLegacy/mac/DOM/DOMHTMLInputElement.mm:55:9: fatal error: 'WebCore/AutofillElements.h' file not found #import <WebCore/AutofillElements.h> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1 error generated. https://build.webkit.org/builders/Apple%20Mojave%20Release%20%28Build%29/builds/6818/steps/compile-webkit/logs/stdio
http://trac.webkit.org/r247282