Make classes and structures in core/inspector fast-allocated.

Source/core/inspector/InspectorBaseAgent.h

Index: Source/core/inspector/InspectorBaseAgent.h
diff --git a/Source/core/inspector/InspectorBaseAgent.h b/Source/core/inspector/InspectorBaseAgent.h
index c3411e75c2891740ccb6230ff0a53c57e88ff3ce..3c1b2632e23517b5ac623b558a4a080afb13687f 100644
--- a/Source/core/inspector/InspectorBaseAgent.h
+++ b/Source/core/inspector/InspectorBaseAgent.h
@@ -48,6 +48,7 @@ class InstrumentingAgents;
 class LocalFrame;
 
 class CORE_EXPORT InspectorAgent : public NoBaseWillBeGarbageCollectedFinalized<InspectorAgent> {
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(InspectorAgent);
 public:
     explicit InspectorAgent(const String&);
     virtual ~InspectorAgent();