Update availability annotations to match the macOS and iOS SDKs in the Xcode 10 GM...

Update availability annotations to match the macOS and iOS SDKs in the Xcode 10 GM seed
https://bugs.webkit.org/show_bug.cgi?id=189561

Reviewed by Tim Horton.

Changed WK_MAC_TBA and WK_IOS_TBA to 10.14 and 12.0, respectively, in all declarations that
appear in the GM seed SDKs.

* Shared/API/Cocoa/_WKRenderingProgressEvents.h:
* UIProcess/API/Cocoa/WKMenuItemIdentifiersPrivate.h:
* UIProcess/API/Cocoa/WKNavigationDelegatePrivate.h:
* UIProcess/API/Cocoa/WKPreferencesPrivate.h:
* UIProcess/API/Cocoa/WKProcessPoolPrivate.h:
* UIProcess/API/Cocoa/WKUIDelegatePrivate.h:
* UIProcess/API/Cocoa/WKUserContentControllerPrivate.h:
* UIProcess/API/Cocoa/WKViewPrivate.h:
* UIProcess/API/Cocoa/WKWebViewConfigurationPrivate.h:
* UIProcess/API/Cocoa/WKWebViewPrivate.h:
* UIProcess/API/Cocoa/WKWebsiteDataRecordPrivate.h:
* UIProcess/API/Cocoa/WKWebsiteDataStorePrivate.h:
* UIProcess/API/Cocoa/_WKAttachment.h:
* UIProcess/API/Cocoa/_WKAutomationDelegate.h:
* UIProcess/API/Cocoa/_WKAutomationSession.h:
* UIProcess/API/Cocoa/_WKAutomationSessionDelegate.h:
* UIProcess/API/Cocoa/_WKFormInputSession.h:
* UIProcess/API/Cocoa/_WKInputDelegate.h:
* UIProcess/API/Cocoa/_WKLinkIconParameters.h:
* UIProcess/API/Cocoa/_WKProcessPoolConfiguration.h:
* UIProcess/API/Cocoa/_WKWebsitePolicies.h:
* WebProcess/InjectedBundle/API/Cocoa/WKWebProcessPlugInEditingDelegate.h:
* WebProcess/InjectedBundle/API/Cocoa/WKWebProcessPlugInScriptWorld.h:
* WebProcess/InjectedBundle/API/mac/WKDOMDocument.h:
* WebProcess/InjectedBundle/API/mac/WKWebProcessPlugIn.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@235961 268f45cc-cd09-0410-ab3c-d52691b4dbfc