Try x64 binary for symupload

symupload is still failing for chrome_child.dll on the 32 bit official
bots. One last try of making an x64 binary instead, and then I'm going
to give up.
BUG=678874, 696257, 696671, 696911,697638

Cr-Original-Commit-Position: refs/heads/master@{#454089}
Cr-Mirrored-Commit: 73dd82d9969add23c5070c12cdbeba8e9e3f13ff
diff --git a/symupload.exe b/symupload.exe
index b06a0ce..7e0e9fb 100755
--- a/symupload.exe
+++ b/symupload.exe
Binary files differ