[Sync] Implement processing of history delete directives

chrome/browser/history/history.h

Index: chrome/browser/history/history.h
diff --git a/chrome/browser/history/history.h b/chrome/browser/history/history.h
index a60add5cc4b0862b314c49a6b8ea62b9a1cfdbd2..34612bcdb492bfd71d3635cd21923ec92cc2ab91 100644
--- a/chrome/browser/history/history.h
+++ b/chrome/browser/history/history.h
@@ -9,8 +9,10 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/bind.h"
 #include "base/callback.h"
 #include "base/file_path.h"
+#include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ -623,6 +625,9 @@ class HistoryService : public CancelableRequestProvider,
 
   base::WeakPtr<HistoryService> AsWeakPtr();
 
+  void ProcessDeleteDirectiveForTest(
+      const sync_pb::HistoryDeleteDirectiveSpecifics& delete_directive);
+
   // syncer::SyncableService implementation.
   virtual syncer::SyncMergeResult MergeDataAndStartSyncing(
       syncer::ModelType type,
@@ -855,6 +860,10 @@ class HistoryService : public CancelableRequestProvider,
   void ProcessDeleteDirective(
       const sync_pb::HistoryDeleteDirectiveSpecifics& delete_directive);
 
+  // Called when a delete directive has been processed.
+  void OnDeleteDirectiveProcessed(
+      const sync_pb::HistoryDeleteDirectiveSpecifics& delete_directive);
+
   // Schedule ------------------------------------------------------------------
   //
   // Functions for scheduling operations on the history thread that have a