Fix Windows compile.

TBR=maruel

Review URL: http://codereview.chromium.org/119083

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17480 0039d316-1c4b-4281-b951-d872f2087c98

base/thread_collision_warner_unittest.cc

@@ -5,6 +5,7 @@
 #include "base/compiler_specific.h"
 #include "base/lock.h"
 #include "base/platform_thread.h"
+#include "base/scoped_ptr.h"
 #include "base/simple_thread.h"
 #include "base/thread_collision_warner.h"
 #include "testing/gtest/include/gtest/gtest.h"