Bug 1476476 - Remove some unused const variables in JumpListBuilder. r=jimm

MozReview-Commit-ID: 4UPr0lWd4iQ

--HG--
extra : rebase_source : 43bcec23f460ab004073cea7e4891aea011674be

widget/windows/JumpListBuilder.cpp

@@ -34,10 +34,6 @@ using mozilla::dom::Promise;
 namespace mozilla {
 namespace widget {
 
-static NS_DEFINE_CID(kJumpListItemCID,     NS_WIN_JUMPLISTITEM_CID);
-static NS_DEFINE_CID(kJumpListLinkCID,     NS_WIN_JUMPLISTLINK_CID);
-static NS_DEFINE_CID(kJumpListShortcutCID, NS_WIN_JUMPLISTSHORTCUT_CID);
-
 // defined in WinTaskbar.cpp
 extern const wchar_t *gMozillaJumpListIDGeneric;