[Mac][WebKit2] Move action menu code into its own file

https://bugs.webkit.org/show_bug.cgi?id=138034
<rdar://problem/18758758>

Reviewed by Dan Bernstein.

* UIProcess/API/mac/WKView.mm:
(-[WKView initWithFrame:context:configuration:webView:]):
Make a WKActionMenuController if needed.

(-[WKView prepareForMenu:withEvent:]):
(-[WKView willOpenMenu:withEvent:]):
(-[WKView didCloseMenu:withEvent:]):
(-[WKView _didPerformActionMenuHitTest:]):
Forward these to WKActionMenuController.

(-[WKView _openURLFromActionMenu:]): Deleted.
(-[WKView _addToReadingListFromActionMenu:]): Deleted.
(-[WKView _quickLookURLFromActionMenu:]): Deleted.
(-[WKView _createActionMenuItemForTag:]): Deleted.
(webKitBundleImageNamed): Deleted.
(-[WKView _copyImage:]): Deleted.
(-[WKView _saveImageToDownloads:]): Deleted.
(temporaryPhotosDirectoryPath): Deleted.
(pathToPhotoOnDisk): Deleted.
(-[WKView _addImageToPhotos:]): Deleted.
(-[WKView _defaultMenuItemsForImage]): Deleted.
(-[WKView _defaultMenuItems]): Deleted.
(-[WKView _updateActionMenu]): Deleted.
Moved to WKActionMenuController.

* UIProcess/mac/WKActionMenuController.h: Added.
* UIProcess/mac/WKActionMenuController.mm: Added.
(-[WKActionMenuController initWithPage:view:]):
(-[WKActionMenuController prepareForMenu:withEvent:]):
(-[WKActionMenuController willOpenMenu:withEvent:]):
(-[WKActionMenuController didCloseMenu:withEvent:]):
(-[WKActionMenuController didPerformActionMenuHitTest:]):
(-[WKActionMenuController _defaultMenuItemsForLink]):
(-[WKActionMenuController _openURLFromActionMenu:]):
(-[WKActionMenuController _addToReadingListFromActionMenu:]):
(-[WKActionMenuController _quickLookURLFromActionMenu:]):
(-[WKActionMenuController _defaultMenuItemsForImage]):
(-[WKActionMenuController _copyImage:]):
(-[WKActionMenuController _saveImageToDownloads:]):
(temporaryPhotosDirectoryPath):
(pathToPhotoOnDisk):
(-[WKActionMenuController _addImageToPhotos:]):
(-[WKActionMenuController _createActionMenuItemForTag:]):
(webKitBundleImageNamed):
(imageForResource:name::if):
(-[WKActionMenuController _updateActionMenuItems]):
Moved from WKView.

* WebKit2.xcodeproj/project.pbxproj:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@175178 268f45cc-cd09-0410-ab3c-d52691b4dbfc