Move GUID utils to src/chrome/common.

base/guid.cc

Index: base/guid.cc
diff --git a/chrome/browser/guid.cc b/base/guid.cc
similarity index 90%
rename from chrome/browser/guid.cc
rename to base/guid.cc
index b8f46dbc7abc3f662977ad5ca54a86590be16c43..f0acb7a5756bd277c2b2ea4ba8edaffba7bd5c3f 100644
--- a/chrome/browser/guid.cc
+++ b/base/guid.cc
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/guid.h"
+#include "base/guid.h"
 
 #include "base/rand_util.h"
 #include "base/stringprintf.h"
 
-namespace guid {
+namespace base {
 
 bool IsValidGUID(const std::string& guid) {
   const size_t kGUIDLength = 36U;
@@ -29,4 +29,4 @@ bool IsValidGUID(const std::string& guid) {
   return true;
 }
 
-}  // namespace guid
+}  // namespace base