Clean up forward declarations in Source/core/loader

Source/core/loader/appcache/ApplicationCacheHost.h

Index: Source/core/loader/appcache/ApplicationCacheHost.h
diff --git a/Source/core/loader/appcache/ApplicationCacheHost.h b/Source/core/loader/appcache/ApplicationCacheHost.h
index 7fe0971b8f73713a0dda68e27330f5cb2938bda6..93bec85df70e36cae6a0e3e011fa859562d1e30e 100644
--- a/Source/core/loader/appcache/ApplicationCacheHost.h
+++ b/Source/core/loader/appcache/ApplicationCacheHost.h
@@ -40,12 +40,8 @@
 namespace blink {
     class ApplicationCache;
     class DocumentLoader;
-    class LocalFrame;
-    class ResourceLoader;
-    class ResourceError;
     class ResourceRequest;
     class ResourceResponse;
-    class SubstituteData;
 
     class ApplicationCacheHost FINAL : public NoBaseWillBeGarbageCollectedFinalized<ApplicationCacheHost>, public WebApplicationCacheHostClient {
         WTF_MAKE_NONCOPYABLE(ApplicationCacheHost);