Expose Cache Storage API in the global scope in stable

Source/modules/serviceworkers/ServiceWorkerGlobalScope.h

Index: Source/modules/serviceworkers/ServiceWorkerGlobalScope.h
diff --git a/Source/modules/serviceworkers/ServiceWorkerGlobalScope.h b/Source/modules/serviceworkers/ServiceWorkerGlobalScope.h
index 6928430576bfb59e191b4cfc826bcfbbab32b33a..ef79c208dbcedffc7fae7d3772a511770377db4e 100644
--- a/Source/modules/serviceworkers/ServiceWorkerGlobalScope.h
+++ b/Source/modules/serviceworkers/ServiceWorkerGlobalScope.h
@@ -39,7 +39,6 @@
 
 namespace blink {
 
-class CacheStorage;
 class Dictionary;
 class Request;
 class ScriptPromise;
@@ -68,8 +67,6 @@ public:
     ServiceWorkerClients* clients();
     ServiceWorkerRegistration* registration();
 
-    CacheStorage* caches(ExecutionContext*);
-
     ScriptPromise fetch(ScriptState*, const RequestInfo&, const Dictionary&, ExceptionState&);
 
     void close(ExceptionState&);
@@ -104,7 +101,6 @@ private:
 
     PersistentWillBeMember<ServiceWorkerClients> m_clients;
     PersistentWillBeMember<ServiceWorkerRegistration> m_registration;
-    PersistentWillBeMember<CacheStorage> m_caches;
     bool m_didEvaluateScript;
     bool m_hadErrorInTopLevelEventHandler;
     unsigned m_eventNestingLevel;