Updating go to 1.8.1 for Win and Linux

BUG=chromium:727089
R=kjellander@chromium.org

Review-Url: https://codereview.chromium.org/2904413002 .
diff --git a/golang/linux/go.tar.gz.sha1 b/golang/linux/go.tar.gz.sha1
index f655489..33671f2 100644
--- a/golang/linux/go.tar.gz.sha1
+++ b/golang/linux/go.tar.gz.sha1
@@ -1 +1 @@
-14068fbe349db34b838853a7878621bbd2b24646
+a433f76c569055ff8536d796995518dd91a9fa5b
diff --git a/golang/win/go.zip.sha1 b/golang/win/go.zip.sha1
index a6bcbab..6a7e1ad 100644
--- a/golang/win/go.zip.sha1
+++ b/golang/win/go.zip.sha1
@@ -1 +1 @@
-ba99083b22e0b22b560bb2d28b9b99b405d01b6b
+26bf854fb81f12e9c80a146d8f0081cd22ae9d02