Bug 1768189 - Part 26: Apply modernize-concat-nested-namespaces to dom/reporting/ReportingHeader.cpp ... r=andi

Depends on D145759

Differential Revision: https://phabricator.services.mozilla.com/D145760

dom/script/ScriptLoadHandler.cpp

@@ -39,8 +39,7 @@
 #include "nsString.h"
 #include "nsTArray.h"
 
-namespace mozilla {
-namespace dom {
+namespace mozilla::dom {
 
 #undef LOG
 #define LOG(args) \
@@ -428,5 +427,4 @@ ScriptLoadHandler::OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
 #undef LOG_ENABLED
 #undef LOG
 
-}  // namespace dom
-}  // namespace mozilla
+}  // namespace mozilla::dom