Move platform_thread to base/threading and put in the base namespace. I left ...

base/threading/thread_checker_unittest.cc

Index: base/threading/thread_checker_unittest.cc
===================================================================
--- base/threading/thread_checker_unittest.cc	(revision 70321)
+++ base/threading/thread_checker_unittest.cc	(working copy)
@@ -4,13 +4,15 @@
 
 #include "base/basictypes.h"
 #include "base/logging.h"
-#include "base/thread_checker.h"
 #include "base/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
 #include "base/threading/simple_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #ifndef NDEBUG
 
+namespace base {
+
 // Simple class to exersice the basics of ThreadChecker.
 // Both the destructor and DoStuff should verify that they were
 // called on the same thread as the constructor.
@@ -139,4 +141,6 @@
 
 #endif  // GTEST_HAS_DEATH_TEST
 
+}  // namespace base
+
 #endif  // NDEBUG