Make classes and structures in core/events and core/fetch fast-allocated.

Source/core/fetch/FetchInitiatorInfo.h

Index: Source/core/fetch/FetchInitiatorInfo.h
diff --git a/Source/core/fetch/FetchInitiatorInfo.h b/Source/core/fetch/FetchInitiatorInfo.h
index 8ffbb79dffd12cb9fde9d29928db179ddc9c3c16..25a7b29307beb971e76f26b0c624e746335d1487 100644
--- a/Source/core/fetch/FetchInitiatorInfo.h
+++ b/Source/core/fetch/FetchInitiatorInfo.h
@@ -26,12 +26,14 @@
 #ifndef FetchInitiatorInfo_h
 #define FetchInitiatorInfo_h
 
+#include "wtf/Allocator.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/TextPosition.h"
 
 namespace blink {
 
 struct FetchInitiatorInfo {
+    DISALLOW_ALLOCATION();
     FetchInitiatorInfo()
         : name()
         , position(TextPosition::belowRangePosition())
@@ -48,6 +50,7 @@ struct FetchInitiatorInfo {
 
 // Encode AtomicString as String to cross threads.
 struct CrossThreadFetchInitiatorInfoData {
+    DISALLOW_ALLOCATION();
     explicit CrossThreadFetchInitiatorInfoData(const FetchInitiatorInfo& info)
         : name(info.name.string().isolatedCopy())
         , position(info.position)