Move statistics_provider to chromeos/system

sync/util/get_session_name.cc

Index: sync/util/get_session_name.cc
diff --git a/sync/util/get_session_name.cc b/sync/util/get_session_name.cc
index 73041aebddcc3e4c5e674a8e95e85597559d3f5c..d51c93e54e63676f5d069bb34f655f7b5baf6d80 100644
--- a/sync/util/get_session_name.cc
+++ b/sync/util/get_session_name.cc
@@ -35,7 +35,7 @@ std::string GetSessionNameSynchronously() {
 #if defined(OS_CHROMEOS)
   // The approach below is similar to that used by the CrOs implementation of
   // StatisticsProvider::GetMachineStatistic(CHROMEOS_RELEASE_BOARD).
-  // See chrome/browser/chromeos/system/statistics_provider.{h|cc}.
+  // See chromeos/system/statistics_provider.{h|cc}.
   //
   // We cannot use StatisticsProvider here because of the mutual dependency
   // it creates between sync.gyp:sync and chrome.gyp:browser.