[part 1] Make classes and structures in modules/ fast-allocated.

Source/platform/AsyncFileSystemCallbacks.h

Index: Source/platform/AsyncFileSystemCallbacks.h
diff --git a/Source/platform/AsyncFileSystemCallbacks.h b/Source/platform/AsyncFileSystemCallbacks.h
index 2f6ee3e342755523b04d7f17c163202c3f2e7d47..ab3ad1bd3fc562e0a5c59700fb6407beac9419b9 100644
--- a/Source/platform/AsyncFileSystemCallbacks.h
+++ b/Source/platform/AsyncFileSystemCallbacks.h
@@ -36,12 +36,14 @@
 #include "platform/blob/BlobData.h"
 #include "public/platform/WebFileWriter.h"
 #include "wtf/Assertions.h"
+#include "wtf/FastAllocBase.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT AsyncFileSystemCallbacks {
+    WTF_MAKE_FAST_ALLOCATED(AsyncFileSystemCallbacks);
     WTF_MAKE_NONCOPYABLE(AsyncFileSystemCallbacks);
 public:
     AsyncFileSystemCallbacks() : m_blockUntilCompletion(false) { }