Remove the duplicated file include.

BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/352223007

Patch from Chunyang Dai <chunyang.dai@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22061 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/code-stubs-ia32.cc

@@ -13,7 +13,6 @@
 #include "src/jsregexp.h"
 #include "src/regexp-macro-assembler.h"
 #include "src/runtime.h"
-#include "src/runtime.h"
 #include "src/stub-cache.h"
 
 namespace v8 {