Make classes and structures in web fast-allocated.

Source/web/ContextMenuClientImpl.h

Index: Source/web/ContextMenuClientImpl.h
diff --git a/Source/web/ContextMenuClientImpl.h b/Source/web/ContextMenuClientImpl.h
index f9b2f5b6c989b5df986b16cbf7c7e752885405d9..9574cb220eccf5f6b6f2c9bfd3a5d35b320270bb 100644
--- a/Source/web/ContextMenuClientImpl.h
+++ b/Source/web/ContextMenuClientImpl.h
@@ -32,6 +32,7 @@
 #define ContextMenuClientImpl_h
 
 #include "core/page/ContextMenuClient.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -39,6 +40,7 @@ class WebViewImpl;
 struct WebContextMenuData;
 
 class ContextMenuClientImpl final : public ContextMenuClient {
+    DISALLOW_ALLOCATION();
 public:
     explicit ContextMenuClientImpl(WebViewImpl* webView) : m_webView(webView) { }
     ~ContextMenuClientImpl() override {}