Move GUID utils to src/chrome/common.

chrome/browser/metrics/metrics_service.cc

Index: chrome/browser/metrics/metrics_service.cc
diff --git a/chrome/browser/metrics/metrics_service.cc b/chrome/browser/metrics/metrics_service.cc
index 30415493d989f463cd2dc47679bc85b1de93fc92..8b171bb855aca396329bb16c45497a2abe19c351 100644
--- a/chrome/browser/metrics/metrics_service.cc
+++ b/chrome/browser/metrics/metrics_service.cc
@@ -160,6 +160,7 @@
 
 #include "base/base64.h"
 #include "base/command_line.h"
+#include "base/guid.h"
 #include "base/md5.h"
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
@@ -169,7 +170,6 @@
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
-#include "chrome/browser/guid.h"
 #include "chrome/browser/load_notification_details.h"
 #include "chrome/browser/memory_details.h"
 #include "chrome/browser/metrics/histogram_synchronizer.h"
@@ -810,7 +810,7 @@ void MetricsService::OnInitTaskComplete(
 }
 
 std::string MetricsService::GenerateClientID() {
-  return guid::GenerateGUID();
+  return base::GenerateGUID();
 }
 
 //------------------------------------------------------------------------------