Bug 1669026 - nsSHEntry.cpp: unused namespace alias decl 'dom' removed. r=sylvestre

Differential Revision: https://phabricator.services.mozilla.com/D92811

docshell/shistory/nsSHEntry.cpp

@@ -28,8 +28,6 @@
 
 extern mozilla::LazyLogModule gPageCacheLog;
 
-namespace dom = mozilla::dom;
-
 static uint32_t gEntryID = 0;
 
 nsSHEntry::nsSHEntry()