[Sync] Remove now-obsolete FastDump class

chrome/browser/sync/engine/process_commit_response_command.h

Index: chrome/browser/sync/engine/process_commit_response_command.h
diff --git a/chrome/browser/sync/engine/process_commit_response_command.h b/chrome/browser/sync/engine/process_commit_response_command.h
index bbc85bff117f367b8053564439749b7b2aa97a79..dbba580d58928e3a15f1361edced1a8016a83c61 100644
--- a/chrome/browser/sync/engine/process_commit_response_command.h
+++ b/chrome/browser/sync/engine/process_commit_response_command.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <set>
+#include <string>
 
 #include "base/basictypes.h"
 #include "chrome/browser/sync/engine/model_changing_syncer_command.h"
@@ -82,7 +83,7 @@ class ProcessCommitResponseCommand : public ModelChangingSyncerCommand {
       syncable::MutableEntry* local_entry);
 
   // Helper to extract the final name from the protobufs.
-  const string& GetResultingPostCommitName(
+  const std::string& GetResultingPostCommitName(
       const sync_pb::SyncEntity& committed_entry,
       const CommitResponse_EntryResponse& entry_response);