Move base/thread.h to base/threading, fix up callers to use the new location.

TEST=it compiles
BUG=none
Review URL: http://codereview.chromium.org/6028009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@70345 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/remoting/client/client_context.h b/remoting/client/client_context.h
index 03273fb..9baa3afa 100644
--- a/remoting/client/client_context.h
+++ b/remoting/client/client_context.h
@@ -7,7 +7,7 @@
 
 #include <string>
 
-#include "base/thread.h"
+#include "base/threading/thread.h"
 #include "remoting/jingle_glue/jingle_thread.h"
 
 namespace remoting {