Oilpan: Move CachedMetadataHandler to Oilpan heap on Oilpan-enabled world.

Source/core/fetch/CachedMetadataHandler.h

Index: Source/core/fetch/CachedMetadataHandler.h
diff --git a/Source/core/fetch/CachedMetadataHandler.h b/Source/core/fetch/CachedMetadataHandler.h
index 96a5122065b4c19acb919c4c4070d119cd306f37..0f0315eb0fa618b255b6e30eb703add1020252a4 100644
--- a/Source/core/fetch/CachedMetadataHandler.h
+++ b/Source/core/fetch/CachedMetadataHandler.h
@@ -5,6 +5,7 @@
 #ifndef CachedMetadataHandler_h
 #define CachedMetadataHandler_h
 
+#include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 
 namespace blink {
@@ -12,13 +13,14 @@ namespace blink {
 class CachedMetadata;
 
 // Handler class for caching operations.
-class CachedMetadataHandler {
+class CachedMetadataHandler : public NoBaseWillBeGarbageCollectedFinalized<CachedMetadataHandler> {
 public:
     enum CacheType {
         SendToPlatform, // send cache data to blink::Platform::cacheMetadata
         CacheLocally // cache only in Resource's member variables
     };
     virtual ~CachedMetadataHandler() { }
+    DEFINE_INLINE_VIRTUAL_TRACE() { }
     // Caches the given metadata in association with this resource and suggests
     // that the platform persist it. The dataTypeID is a pseudo-randomly chosen
     // identifier that is used to distinguish data generated by the caller.