[release-branch.go1.5] go1.5.3

Change-Id: Id0700749ff51122cd3e0793f5d6adb50121bfe6c
Reviewed-on: https://go-review.googlesource.com/18595Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>

VERSION

-go1.5.2
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+go1.5.3
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