Revert of ServiceWorker: Remove Clients.getAll()

Source/core/frame/UseCounter.cpp

Index: Source/core/frame/UseCounter.cpp
diff --git a/Source/core/frame/UseCounter.cpp b/Source/core/frame/UseCounter.cpp
index 88a4e64ba5b12fceed16286b81fd18ad341413d1..12344a890db569fda11cd491fb9fa3dcd441df16 100644
--- a/Source/core/frame/UseCounter.cpp
+++ b/Source/core/frame/UseCounter.cpp
@@ -859,6 +859,9 @@
     case ServiceWorkerClientPostMessage:
         return "'Client.postMessage()' is an experimental API and may change. See https://github.com/slightlyoff/ServiceWorker/issues/609.";
 
+    case ServiceWorkerClientsGetAll:
+        return "'Clients.getAll()' is deprecated and will be removed soon. Please use 'Clients.matchAll()' instead.";
+
     case AttrChildAccess:
     case AttrChildChange:
         return "Attr child nodes are deprecated and will be removed in M45, around August 2015. Please use 'Attr.value' instead.";