DevTools: use per-LocalFrame instrumenting agents instead of per-Page ones.

Source/core/fetch/ResourceFetcher.cpp

Index: Source/core/fetch/ResourceFetcher.cpp
diff --git a/Source/core/fetch/ResourceFetcher.cpp b/Source/core/fetch/ResourceFetcher.cpp
index 341e93ff3bf15e664db3f70e78059f31d6449b13..d67eb023c759718c5305aaf0c69adfaee7704ab3 100644
--- a/Source/core/fetch/ResourceFetcher.cpp
+++ b/Source/core/fetch/ResourceFetcher.cpp
@@ -1221,7 +1221,7 @@ void ResourceFetcher::notifyLoadedFromMemoryCache(Resource* resource)
     context().dispatchDidLoadResourceFromMemoryCache(request, resource->response());
     // FIXME: If willSendRequest changes the request, we don't respect it.
     willSendRequest(identifier, request, ResourceResponse(), resource->options().initiatorInfo);
-    InspectorInstrumentation::markResourceAsCached(frame()->page(), identifier);
+    InspectorInstrumentation::markResourceAsCached(frame(), identifier);
     context().sendRemainingDelegateMessages(m_documentLoader, identifier, resource->response(), resource->encodedSize());
 }