MemoryCache: Enable MemoryCache to have multiple isolated resource maps

Source/core/inspector/InspectorPageAgent.cpp

Index: Source/core/inspector/InspectorPageAgent.cpp
diff --git a/Source/core/inspector/InspectorPageAgent.cpp b/Source/core/inspector/InspectorPageAgent.cpp
index 5816a89fb65a0e87f98bf673854b766fa16e96ba..f8f25a28e0ee708ba30e16c5e9a734adcd5831b1 100644
--- a/Source/core/inspector/InspectorPageAgent.cpp
+++ b/Source/core/inspector/InspectorPageAgent.cpp
@@ -347,7 +347,7 @@ Resource* InspectorPageAgent::cachedResource(LocalFrame* frame, const KURL& url)
         }
     }
     if (!cachedResource)
-        cachedResource = memoryCache()->resourceForURL(url);
+        cachedResource = memoryCache()->resourceForURL(url, document->fetcher()->getCacheIdentifier());
     return cachedResource;
 }