chrome: Cleanup class/struct forward declarations

chrome/browser/safe_browsing/client_side_detection_service.h

Index: chrome/browser/safe_browsing/client_side_detection_service.h
diff --git a/chrome/browser/safe_browsing/client_side_detection_service.h b/chrome/browser/safe_browsing/client_side_detection_service.h
index 0b0ee63722c79ec49c55eaa349935cd81a3ab728..b28b7f7540ebdbaebed0e6572ea37ce4a5fc263e 100644
--- a/chrome/browser/safe_browsing/client_side_detection_service.h
+++ b/chrome/browser/safe_browsing/client_side_detection_service.h
@@ -34,10 +34,6 @@
 #include "net/url_request/url_fetcher_delegate.h"
 #include "url/gurl.h"
 
-namespace base {
-class TimeDelta;
-}
-
 namespace content {
 class RenderProcessHost;
 }
@@ -51,8 +47,6 @@ class URLRequestStatus;
 namespace safe_browsing {
 class ClientMalwareRequest;
 class ClientPhishingRequest;
-class ClientPhishingResponse;
-class ClientSideModel;
 
 // Main service which pushes models to the renderers, responds to classification
 // requests. This owns two ModelLoader objects.