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

Source/core/fetch/ResourceClientWalker.h

Index: Source/core/fetch/ResourceClientWalker.h
diff --git a/Source/core/fetch/ResourceClientWalker.h b/Source/core/fetch/ResourceClientWalker.h
index 3f35eca9dacde177a12cfeebc2c48e8cd790ed47..20d49659d9710c450c457e4e1bfcc06a14ddd9ff 100644
--- a/Source/core/fetch/ResourceClientWalker.h
+++ b/Source/core/fetch/ResourceClientWalker.h
@@ -26,6 +26,7 @@
 #define ResourceClientWalker_h
 
 #include "core/fetch/ResourceClient.h"
+#include "wtf/Allocator.h"
 #include "wtf/HashCountedSet.h"
 #include "wtf/Vector.h"
 
@@ -34,6 +35,7 @@ namespace blink {
 // Call this "walker" instead of iterator so people won't expect Qt or STL-style iterator interface.
 // Just keep calling next() on this. It's safe from deletions of items.
 template<typename T> class ResourceClientWalker {
+    STACK_ALLOCATED();
 public:
     ResourceClientWalker(const HashCountedSet<ResourceClient*>& set)
         : m_clientSet(set), m_clientVector(set.size()), m_index(0)