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

Source/core/fetch/ClientHintsPreferences.h

Index: Source/core/fetch/ClientHintsPreferences.h
diff --git a/Source/core/fetch/ClientHintsPreferences.h b/Source/core/fetch/ClientHintsPreferences.h
index e8ff58676153776c538a3bedae99a49ec62d251b..b5cd2d7f13e9e6cec7d2623bffd4a830e1acc879 100644
--- a/Source/core/fetch/ClientHintsPreferences.h
+++ b/Source/core/fetch/ClientHintsPreferences.h
@@ -6,6 +6,7 @@
 #define ClientHintsPreferences_h
 
 #include "core/CoreExport.h"
+#include "wtf/Allocator.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
@@ -13,6 +14,7 @@ namespace blink {
 class ResourceFetcher;
 
 class CORE_EXPORT ClientHintsPreferences {
+    DISALLOW_ALLOCATION();
 public:
     ClientHintsPreferences();