Remove an unnecessary #include section from render_process_host_impl.cc.

#include <utility> in render_process_host_impl.cc is not necessary anymore.

Review URL: https://codereview.chromium.org/695203002

Cr-Commit-Position: refs/heads/master@{#302454}

content/browser/renderer_host/render_process_host_impl.cc

@@ -11,10 +11,6 @@
 #include <limits>
 #include <vector>
 
-#if defined(OS_POSIX)
-#include <utility>  // for pair<>
-#endif
-
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"