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

Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h

Index: Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h
diff --git a/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h b/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h
index cafeec83d6266cfb8d8fcf098a75a4490c5b0e9a..4000da94877045a4e3986d0bb7450a5da6200dcc 100644
--- a/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h
+++ b/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h
@@ -26,6 +26,7 @@ class WebMediaPlayer;
 
 class MODULES_EXPORT HTMLMediaElementEncryptedMedia final : public NoBaseWillBeGarbageCollectedFinalized<HTMLMediaElementEncryptedMedia>, public WillBeHeapSupplement<HTMLMediaElement>, public WebMediaPlayerEncryptedMediaClient {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElementEncryptedMedia);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(HTMLMediaElementEncryptedMedia);
 public:
     // encrypted media extensions (v0.1b)
     static void webkitGenerateKeyRequest(HTMLMediaElement&, const String& keySystem, PassRefPtr<DOMUint8Array> initData, ExceptionState&);