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

Source/core/fetch/ClientHintsPreferences.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ClientHintsPreferences_h
 #define ClientHintsPreferences_h
 
 #include "core/CoreExport.h"
+#include "wtf/Allocator.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ResourceFetcher;
 
 class CORE_EXPORT ClientHintsPreferences {
+    DISALLOW_ALLOCATION();
 public:
     ClientHintsPreferences();
 
     void updateFrom(const ClientHintsPreferences&);
     void updateFromAcceptClientHintsHeader(const String& headerValue, ResourceFetcher*);
 
     bool shouldSendDPR() const { return m_shouldSendDPR; }
     void setShouldSendDPR(bool should) { m_shouldSendDPR = should; }
 
     bool shouldSendResourceWidth() const { return m_shouldSendResourceWidth; }
     void setShouldSendResourceWidth(bool should) { m_shouldSendResourceWidth = should; }
 
     bool shouldSendViewportWidth() const { return m_shouldSendViewportWidth; }
     void setShouldSendViewportWidth(bool should) { m_shouldSendViewportWidth = should; }
 
 private:
     bool m_shouldSendDPR;
     bool m_shouldSendResourceWidth;
     bool m_shouldSendViewportWidth;
 };
 
 } // namespace blink
 
 #endif