recompress go_talk.pdf by running through ghostscript.
was 1153 kB now 247 kB

R=r
http://go/go-review/1018025
diff --git a/doc/go_talk-20091030.pdf b/doc/go_talk-20091030.pdf
index 87ef93c..5139ff2 100644
--- a/doc/go_talk-20091030.pdf
+++ b/doc/go_talk-20091030.pdf
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