Replace setIndexedDBClientCreateFunction madness with Supplements

third_party/WebKit/Source/web/IndexedDBClientImpl.h

Index: third_party/WebKit/Source/web/IndexedDBClientImpl.h
diff --git a/third_party/WebKit/Source/web/IndexedDBClientImpl.h b/third_party/WebKit/Source/web/IndexedDBClientImpl.h
index 04a85883e221829449f85d5642256577055a2b69..06f6aab0fb55ee3ef7d692b22e0fea0231079f87 100644
--- a/third_party/WebKit/Source/web/IndexedDBClientImpl.h
+++ b/third_party/WebKit/Source/web/IndexedDBClientImpl.h
@@ -41,14 +41,18 @@ class ExecutionContext;
 // the dependency but we cannot use ChromeClient here because
 // IndexedDBClientImpl is used by worker threads but ChromeClient works only
 // for the main thread.
-class IndexedDBClientImpl final : public IndexedDBClient {
+class IndexedDBClientImpl final : public GarbageCollectedFinalized<IndexedDBClientImpl>, public IndexedDBClient {

[haraken, 2016/04/09 01:12:40]

This will work, but it may be a bit cleaner to make IndexedDBClient
GarbageCollectedFinalized (and move USING_GARBAGE_COLLECTED_MIXIN to
IndexedDBClient)?

[jsbell, 2016/04/13 18:57:57]

Done. Also lets me re-inline the IndexedDBClientImpl ctor.

+    USING_GARBAGE_COLLECTED_MIXIN(IndexedDBClientImpl);
 public:
     static IndexedDBClient* create();
 
+    ~IndexedDBClientImpl() override;
+    DECLARE_VIRTUAL_TRACE();
+
     bool allowIndexedDB(ExecutionContext*, const String& name) override;
 
 private:
-    IndexedDBClientImpl() { }
+    IndexedDBClientImpl();
 };
 
 } // namespace blink