Update inspector classes to use OVERRIDE / FINAL when needed

Source/core/inspector/InspectorFileSystemAgent.h

Index: Source/core/inspector/InspectorFileSystemAgent.h
diff --git a/Source/core/inspector/InspectorFileSystemAgent.h b/Source/core/inspector/InspectorFileSystemAgent.h
index 24e68ab0e33dc12674794928a4660aa2d3d379a1..e2ac3108999fa3f1750a3dea18541e69b1daf8df 100644
--- a/Source/core/inspector/InspectorFileSystemAgent.h
+++ b/Source/core/inspector/InspectorFileSystemAgent.h
@@ -41,7 +41,7 @@ class InspectorPageAgent;
 class ExecutionContext;
 class SecurityOrigin;
 
-class InspectorFileSystemAgent : public InspectorBaseAgent<InspectorFileSystemAgent>, public InspectorBackendDispatcher::FileSystemCommandHandler {
+class InspectorFileSystemAgent FINAL : public InspectorBaseAgent<InspectorFileSystemAgent>, public InspectorBackendDispatcher::FileSystemCommandHandler {
 public:
     static PassOwnPtr<InspectorFileSystemAgent> create(InstrumentingAgents*, InspectorPageAgent*, InspectorCompositeState*);
     virtual ~InspectorFileSystemAgent();