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

Source/modules/fetch/FetchDataConsumerHandle.h

Index: Source/modules/fetch/FetchDataConsumerHandle.h
diff --git a/Source/modules/fetch/FetchDataConsumerHandle.h b/Source/modules/fetch/FetchDataConsumerHandle.h
index d5da177d7e9283753fadb13a5e09d114fe88409b..1169766db78942b4a138b4c3f0c33de250d13d12 100644
--- a/Source/modules/fetch/FetchDataConsumerHandle.h
+++ b/Source/modules/fetch/FetchDataConsumerHandle.h
@@ -21,8 +21,10 @@ namespace blink {
 // to create a reference cycle. When an client is garbage collected, making
 // the client own the handle is the right way.
 class MODULES_EXPORT FetchDataConsumerHandle : public WebDataConsumerHandle {
+    WTF_MAKE_FAST_ALLOCATED(FetchDataConsumerHandle);
 public:
     class Reader : public WebDataConsumerHandle::Reader {
+        WTF_MAKE_FAST_ALLOCATED(Reader);
     public:
         enum BlobSizePolicy {
             // The returned blob must have a valid size (i.e. != kuint64max).