Introduce RunLoop::Delegate splitting RunLoop/MessageLoop some more.

content/public/test/cache_test_util.h

Index: content/public/test/cache_test_util.h
diff --git a/content/public/test/cache_test_util.h b/content/public/test/cache_test_util.h
index 53f001977d66b56ad93f6acaa85e7c0c32ebb474..d34a758064baccf49c2412e99dfe4015be019471 100644
--- a/content/public/test/cache_test_util.h
+++ b/content/public/test/cache_test_util.h
@@ -7,11 +7,16 @@
 
 #include <set>
 #include <vector>
+
 #include "base/run_loop.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/storage_partition.h"
 #include "net/disk_cache/disk_cache.h"
 
+namespace base {
+class WaitableEvent;
+}
+
 namespace content {
 
 // A util class that can be used to create and retreive cache entries.