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

chrome/browser/safe_browsing/safe_browsing_test.cc

Index: chrome/browser/safe_browsing/safe_browsing_test.cc
===================================================================
--- chrome/browser/safe_browsing/safe_browsing_test.cc	(revision 70328)
+++ chrome/browser/safe_browsing/safe_browsing_test.cc	(working copy)
@@ -25,6 +25,7 @@
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/string_split.h"
+#include "base/threading/platform_thread.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
@@ -452,7 +453,7 @@
       // Wait and try again if last fetch was failed. The loop will hit the
       // timeout in OutOfProcTestRunner if the fetch can not get success
       // response.
-      PlatformThread::Sleep(TestTimeouts::action_timeout_ms());
+      base::PlatformThread::Sleep(TestTimeouts::action_timeout_ms());
     }
   }