[Sync] Clean up sync logging

chrome/browser/sync/sessions/session_state.cc

Index: chrome/browser/sync/sessions/session_state.cc
diff --git a/chrome/browser/sync/sessions/session_state.cc b/chrome/browser/sync/sessions/session_state.cc
index e426d00cadd92cb55c17d5da1ad6d93a87b5a361..cb089d972cf887bf3a87e1a576ec19e44408e07c 100644
--- a/chrome/browser/sync/sessions/session_state.cc
+++ b/chrome/browser/sync/sessions/session_state.cc
@@ -11,6 +11,8 @@
 #include <vector>
 
 #include "base/base64.h"
+#include "base/json/json_writer.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/browser/sync/protocol/proto_enum_conversions.h"
 
@@ -172,6 +174,13 @@ DictionaryValue* SyncSessionSnapshot::ToValue() const {
   return value;
 }
 
+std::string SyncSessionSnapshot::ToString() const {
+  scoped_ptr<DictionaryValue> value(ToValue());
+  std::string json;
+  base::JSONWriter::Write(value.get(), true, &json);
+  return json;
+}
+
 ConflictProgress::ConflictProgress(bool* dirty_flag) : dirty_(dirty_flag) {}
 
 ConflictProgress::~ConflictProgress() {