Clean up forward declarations in Source/modules

Source/modules/indexeddb/IDBTransaction.h

Index: Source/modules/indexeddb/IDBTransaction.h
diff --git a/Source/modules/indexeddb/IDBTransaction.h b/Source/modules/indexeddb/IDBTransaction.h
index 426fbffaea842b82ac0811022fe33c8b4305d2d6..4c92766ec383b00aebc0ab8c006df9148ed771a2 100644
--- a/Source/modules/indexeddb/IDBTransaction.h
+++ b/Source/modules/indexeddb/IDBTransaction.h
@@ -34,16 +34,13 @@
 #include "modules/EventTargetModules.h"
 #include "modules/indexeddb/IDBMetadata.h"
 #include "modules/indexeddb/IndexedDB.h"
-#include "platform/heap/Handle.h"

[jsbell, 2014/10/13 18:43:22]

This file uses Member<> - why remove?

 #include "public/platform/WebIDBDatabase.h"
-#include "public/platform/WebIDBTypes.h"

[jsbell, 2014/10/13 18:43:22]

This is used for the various enum values referenced in the file, e.g.
WebIDBTransactionModeReadOnly

 #include "wtf/HashSet.h"
 
 namespace blink {
 
 class DOMError;
 class ExceptionState;
-class IDBCursor;
 class IDBDatabase;
 class IDBObjectStore;
 class IDBOpenDBRequest;